Jenny was worried about how some pollutants in a lake near her home were affecting the levels of dissolved oxygen in the water, so
she designed the following experiment.
First, she collected five 10-gallon aquariums and filled each with water from her tap. Then, she tested the initial oxygen level of the
tap water.
Next, she put a tablespoon of different pollutants, including gasoline, cooking oil paint, and lawn fertilizer, in each of four of the
tanks. She stirred those four tanks for 1 minute each to help the pollutant dissolve or spread out in the tank.
Finally, she tested the oxygen level in each tank once every hour and recorded her results in the table below.
Tank
Pollutant
in water
Initial
O2 level
(without pollutants)
O2 level O2 level
after 1 hour after 2 hours
1 none
2 gasoline
3 cooking oil
4 paint
5 lawn fertilizer
What is the dependent variable in Jenny's experiment?
OA. initial oxygen level in tank without pollutant
OB. levels of Oz in each tank
OC. amount of pollutant put in each tank
OD. pollutant in each tank

Answers

Answer 1

Answer:

levels of o2 in each tank

Explanation:

You can control the pollutant levels.I am super bad at explanations but i answered this question and got it right .


Related Questions

Can I have help pls I do not understand this

Answers

thermal conductivity is not the answer for this question because it does not work

Which is an observation?
1.Data and information you gather usually by using
your senses or a tool
2.Conclusions based on evidence

Answers

Explanation:

Which is an observation?

l think number 1 is write

Which health claims decreased in number during each year listed?

Answers

Explanation:

Health claims describe a relationship between a food substance (a food, food component, or dietary supplement ingredient), and reduced risk of a disease or health-related condition.

An example of an authorized health claim is, "Adequate calcium and vitamin D as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life."

the major causes of ocean pollution are oil spills and sewage treatment

true or false

answer quick !!

Answers

Answer:

true

Ocean pollution is caused by the introduction of toxic pollutants such as industrial wastes , chemicals, oil spills and plastic litter.

different between annual plant and Biennial plants​

Answers

Answer:

Annual plants germinate, bloom, set seed and die all in one year. Biennial plants have a life cycle of two years so they germinate and grow one year, bloom and die the following. Everything which lasts longer than two years is Perennial, which in practical terms usually means it grows and flowers for many years.

Explanation:

Hopes this helps. Mark as brainlest plz!

Hii.
Good morning sandhya..
what is photosynthetic ..?

Answers

Answer:

[tex]\huge\mathcal{\purple{A}\green{n}\pink{s}\blue{w}\purple{e}\green{r}}[/tex]

PHOTOSYNTHESIS IS A PROCESS IN WHICH GREEN PLANTS PREPARE THEIR OWN FOOD BY WATER AND CARBON DIOXIDE IN THE PRESENCE OF CHLOROPHYLL AND SUNLIGHT.

[tex]\rule{255mm}{2mm}[/tex][tex]\rule{255mm}{2mm}[/tex][tex]\rule{255mm}{2mm}[/tex][tex]\rule{255mm}{2mm}[/tex]


Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities.

Which of the following are considered gases

Answers

Answer:

Lol

Explanation:

I can't see any option mate. How will I be able to know what to answer

Which statement accurately describes the variables in this study?

Answers

Answer:

write full question please

List all the ways you can think of that carbon passes from the biosphere to the lithosphere

Answers

Answer:

Carbon is stored on our planet in the following major sinks (1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere; (3) as organic matter in soils;

plants can change the main product of photosynthesis into other substances. Name two of these substances and describe the function of each​

Answers

Answer:

The products of photosynthesis are glucose and oxygen. Glucose is used by plants for energy and to make other substances like cellulose and starch. Oxygen is released as a byproduct/waste product. In cellular respiration, oxygen is used to break down glucose, releasing chemical energy and heat in the process.

Explanation:

Specifically, plants use energy from sunlight to react carbon dioxide and water to produce sugar (glucose) and oxygen. Many reactions occur, but the overall chemical reaction for photosynthesis is: Carbon Dioxide + Water + Light yields Glucose + Oxygen

Define hydrophilic.
How does that change the relationship that phospholipids have to water?
What is the function of steroid? Give an example of a steroid.

Answers

Hydrophilic (water-loving) or could be called water, it mean attracting water molecules as close as possible, the phospholipid is made up of a head that is polar, and a tail that is non polar or in another words called “hydrophobic” , this means that the head of the phospholipid is attracted to water molecules ( this helps you understand the structure of cell membrane formation). Steriod, a class of lipids, some hormones like cholesterol are made up of steroids. They maintain fluidity of cell membrane. Example: oestrogens

As temperature rises from 25 degrees to 60 degrees, the material heat and its kinetic energy as the material goes through vaporization to become a gas.

1. absorbs, increases

2. releases, does not change

3. multiplies its, is divided

4. remains the same, decreases

Answers

Answer:

1

Explanation:

the material absords heat ( so the temperature increase or the heat can be use to increase kinetic energy)

increase its kinetic energy

¿Qué ocurre cuando inspiramos?

Answers

Answer:

Cuando respiramos, el diafragma se mueve hacia abajo, en dirección al abdomen, y los músculos de las costillas empujan a las costillas hacia arriba y hacia afuera. Esto hace que la cavidad torácica se agrande y tome aire a través de la nariz y la boca para enviarlo a los pulmones.

RNA differs from DNA in the type of a) purines & pyrimidness b) sugars & Purmes c) sugar & pyrimidness. dl pyrimidness (please give right answer only)​

Answers

Answer:

There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.

So, the answer is

Explanation:

Which of the following
is not a type of fatty acid?

Answers

Answer:

which one ?? where are the options????

Phenyl acetic acid is not a type of fatty acid (option D

What is a fatty acid?

A fatty acid is a long-chain carboxylic acid. It consists of a hydrocarbon chain with a carboxyl group at one end. Fatty acids are found in animal and plant fats, and they are an important part of the human diet.

Phenyl acetic acid is not a fatty acid because it does not have a long carbon chain. It is a short-chain carboxylic acid with only six carbon atoms. Short-chain carboxylic acids are not considered to be fatty acids.

Learn about fatty acid here https://brainly.com/question/27960389

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Complete question:

Which of the following is not a type of fatty acid?

Stearic acid

Palmitic acid

Propionic acid

Phenyl acetic acid

Todas las celulas contienen organelas?

Answers

Answer:

Cada célula de su cuerpo contiene orgánulos (estructuras que tienen funciones específicas). Al igual que los órganos del cuerpo, cada orgánulo contribuye a su manera a ayudar a que la célula funcione bien como un todo. El núcleo, las mitocondrias y los cloroplastos son todos orgánulos. ... Algunos orgánulos se encuentran solo en algunos tipos de células.

Explanation:

de nada

Let us Practice
Sheila bought a hamster in a small pet shop. To feed it properly, she
needs to know its weight. If the hamster has a mass of 190.0 g, what is
its weight?

Answers

Answer:

190*10=1900N

Explanation:

it is mentioned that its mass is 190g. So the weight must be equal to the product of mass and acceleration due to gravity.

taking acceleration due to gravity 10m/s2 the answer must be 1900N

But the accurate vale is 9.8m/s2.

also let me know if the answer was correct.

thanks

There are 3 main categories of environmental problems that have come about because of the population growth. What are they and explain how the growth of the population has brought about each one?

Answers

Answer:

i)declination of resources

ii) air, water and land pollution

iii) global warming

Explanation:

As we all know that population is increasing day by day, all the country of the world are facing rapid population growth.we are facing many problems, the population growth is increasing day by day, the more the population, the more resources we need due to this, the resources is decreasing day by day, we need more resources as there is more population, the increasing population makes more pollution due to this global warming is increasing. We know that there is no more more resources in our world if the resources is finished in this day the future generation will not be able to survive and will not be able to use such resources.we should prevent such resources for future generation also the future generation should get the chance to use such resources .the pollution is increasing day by day .we should control it .the main thing is that we should control the rapid population growth population growth should be controlled due to this global warming is increasing which is very dangerous leading to the declination of ozone layer due to which the harmful rays of sun may enter the earth which may cause various problems in us and cause various diseases due to which we may die.the main thing is that we should stop the population growth, we should conduct public awareness programmes and many more programmes to educate people. Population growth also creates deforestation as the number of people are increasing day by day they need more place to live ,they need more Land due to this they cut down the trees of forest and used to make houses there due to which deforestation takes place. we all know that deforestation is the process of cutting down trees. so the tree should not be cut down as it is the source of oxygen for all creatures living in this whole world and the main thing is that we should provide education to the children and the youth and many more. if we are educated we can stop such population growth. so the main thing is that we should stop population growth by giving education. Education is the only one way to stop such population growth.

why is saline soil a problem

Answers

Answer:

Saline soil is a problem because high osmotic stress, nutritional disorders and toxicities.

what does the term resolution mean

Answers

Answer:

the process of reducing or separating something into constituent parts or components.

what are the effects of changes in one of earth four spheres on each of the other spheres?​

Answers

Answer:

An event can cause changes to occur in one or more of the spheres, and/or an event can be the effect of changes in one or more of Earth's four spheres. This two-way cause and effect relationship between an event and a sphere is called an interaction. Interactions also occur among the spheres.

Hope it helps you.

Statement
true or False

Our solar system contains planets, moons, smaller space bodies, the sun, and numerous stars.

why do you think this way?​

Answers

The answer to your question is true

Which of the following statements is true about vaccine?
A. Vaccine is a blood plasma.
B. Vaccine is a white blood cell.
C. Vaccine is a type of antibody. D. Vaccine is a weakened or dead pathogen.​

Answers

Answer:

vaccine is a type of antibody

Dalton’s theory was identified using

light microscope images of atoms.
the experimental results of other scientists.
water vapor and air experiments.

Answers

Answer:

Explanation:

Actually it was the experimental results of other scientists. The main stems of the theory was the indivisibility of small spheres (his image) that represented the elements he knew which reacted with other elements.

They seemed to give the same ratios in reactions (definite proportions) and multiple whole number ratios. Look up Lavoisier.

what are the reasons for the adaptation of organisms to the environment​

Answers

Answer:

The reasons for the adaptation of organisms to the environment are

 to adapt to their habitat to be able to survive.

Hope it helps you.

Answer:

All organisms need to adapt to their habitat to be able to survive. This means adapting to be able to survive the climatic conditions of the ecosystem, predators, and other species that compete for the same food and space.

Which is NOT a condition required for allele frequencies to remain the same over time?
a. natural selection
b. random mating
c. very large population
d. absence of mutation

Answers

C. Very large population

Identify the Levels of Organization in a Multicellular Organism

1: Cells

2: Organ System

3: Tissue

4: Organ

DONE!

Answers

Answer:

2 3 4. is the correct answer

a point where the plate boundaries meet​

Answers

Answer: a transform or a lateral fault

Explanation:

Suppose you have a beaker of sugar and a beaker of salt. They are unlabeled and the white crystals look identical. Your assignment is to identify each one. Tasting would make identification easy, but you should never taste anything in a science lab. Instead, you can use scientific knowledge and investigation to help you identify each substance.
Substance Formula Melting Point Conductivity
Table salt NaCl ? ?
Table sugar C12H22O11 ? ?

Examine the chemical formulas for salt and sugar given in the table. What do they tell you about what type of bonding is present in each compound?
A. Both molecules contain ionic bonds.
B. Both molecules contain covalent bonds.
C. NaCl contains a covalent bond, and C12H22O11 contains ionic bonds.
D. NaCl contains an ionic bond, and C12H22O11 contains covalent bonds.

Answers

D. NaCl contains an ionic bond and C12H22O11 contains covalent bonds.

As per the given scenario, NaCl contains an ionic bond, and [tex]C_1_2H_2_2O_1_1[/tex] contains covalent bonds. The correct option is D.

What is the difference between ionic and covalent bonding?

An atom can primarily participate in two types of bonding: covalent and ionic. The sharing of electrons between two or more atoms is referred to as covalent bonding.

When two or more ions come together and are held together by charge differences, ionic bonds form.

Covalent bonds are formed when two nonmetals come together, whereas ionic bonds are formed when a metal and a nonmetal come together.

Molecules formed by covalent bonds have a lower melting point than those formed by ionic bonds. The boiling point has the same relationship.

Electrons are basically involved in the formation of both ionic and covalent bonds.

NaCl is possess ionic bonding between sodium and chlorine ions, while table sugar have covalent bond.

Thus, the correct option is D.

For more details regarding ionic and covalent bonding, visit:

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state the enzymes that catalyses the digestion of starch and fats​

Answers

Amylase for starch lipase for fats including lipids and glycerol
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