Three students each added equal volumes of pond water to four beakers and placed each beaker in a different water bath. Each student maintained the water baths at temperatures shown in the data table below. The students then added an equal number of water fleas to each of the four beakers. After one hour, the students used microscopes to determine the average heart rate of the water fleas. The procedure was repeated for a total of three trials at each temperature. The results of the investigation are summarized in the data table below.

Which component of the experiment above is the independent variable?

A. average water flea heart rate

B. number of fleas per beaker

C. number of trials

D. water temperature

Answers

Answer 1

The independent variable is the water temperature because it is not dependent on the change of another variable so the answer would be D

Answer 2

Answer: D. water temperature

Explanation:

An independent variable is the something which can be altered or manipulated while doing an experiment so as to determine the effect of such change over the other variable that is the dependent variable or the experimental variable.

Here, in the given experiment the water temperature is the independent variable whose effect can be observed on the dependent variable that is the average water flea heart rate.

Related Questions

Sulfur is a nonmetalic mineral that has a density of 2 g/cm3. The volume of a sample of sulfur was measured to be 5.0 cm3. What is the mass of the sample?

Answers

Final answer:

The mass of a 5.0 cm³ sample of sulfur with a density of 2 g/cm³ is 10 grams. The calculation involves simply multiplying the given density by the volume.

Explanation:

The question is asking about calculating the mass of a sample of sulfur given the density and volume. The density of a substance is the ratio of the mass of a sample of the substance to its volume. The density of sulfur is given as 2 g/cm³. To find the mass of the sample, you simply multiply the density and volume. In this case, the volume is 5.0 cm³, so the mass is 2 g/cm³ x 5.0 cm³ = 10 grams.

This is based on the general principle that density = mass/volume. In this situation, sulfur is a nonmetallic mineral, and like many nonmetals, it has an oxidation state of 2-. Sulfur can react with most metals and readily forms the sulfide ion, S²-, further indicating its nonmetallic nature.

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to meet cellular needs for food,water,energy,waste removal,multicellular organisms have developed various specializations,such as organs,and organ systems.

Answers

Answer:

The correct answer will be- true and structural specializations

Explanation:

The evolution of life on earth has suggested that life has moved from the simplicity to complexity or from single-celled organism to multicellular organism.

This multi-cellularity is achieved through the property of called cellular differentiation and specialization. as the cellular complexity increases, therefore, cellular demands like the use of energy, food, water and other variables increased.

This lead to the formation of the organ and organs system specializes to perform specific functions like the digestive system and another biological system.

Thus, true and structural specializations are the correct answer.

Answer: the answer is Structural

which of the following statements best describes the major difference between metaphase 1 of meiosis and metaphase of mitosis? (a) in metaphase 1 tetard srts of homologous chromosomes stay together as they line up along the center of the cell (b) in metaphase homologous chromosomes sre separated as each sister chromatid set os pulled to one end of the cell (c) im metaphase sister chromatids are separated and pulled apart to form a total of four new haploid cells. (d) in metaphase 1 sets of sister chromatids line up at the center of the cell and spindle fibers pull them apart.

Answers

the answer would be A also seen as the first statment

The statement that best describes the major difference between metaphase 1 of meiosis and metaphase of mitosis is as follows:

In metaphase 1, tetrad sets of homologous chromosomes stay together as they line up along the center of the cell.

Thus, the correct option is A.

What is Mitosis?

Mitosis may be defined as a type of cell division through which a parental cell produces two genetically identical daughter cells which are usually diploid in nature.

In the metaphase of mitosis, the chromosomes usually line up in one plane and form an equatorial plane. The chromosomes are attached to the spindle through the centromere.

While in the metaphase of meiosis I, the bivalents are arranged on the equatorial plane and the centromeres of each chromosome divide longitudinally.

Therefore, the correct option for this question is A.

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The complete complex of DNA and protein in a cell is known as _________ .

Answers

Chromatin: the complex of DNA and proteins that composes a chromosome in eukaryotic cells.

which of the following is TRUE about earthquakes?
Select one:
Earthquakes happen along cracks in the earth's surface, called fault lines, and can only be felt near the epicenter of the quake.
Earthquakes can be accurately predicted with scientific monitoring.
Earthquakes happen along cracks in the earth's surface, called fault lines, and can be felt over large areas.
Earthquakes occurr randomly all over the planet, so it is impossible to determine where earthquake risk is high.

Answers

My answer would be "Earthquakes happen along cracks in the earth's surface, called fault lines, and can be felt over large areas"

The following is true about earthquakes: earthquake occur along cracks in the earth's surface, known as fault lines, and can be felt over wide areas, as in option C or the third option.

What exactly is an earthquake, and what does it mean?

Earthquakes are caused by the sudden release of energy that has been stored in the earth's crust, often along fault lines, and the shaking can be felt over large areas, the strength of the shaking depends on a variety of factors, including the magnitude of the earthquake. Scientists can monitor earthquake activity and use various techniques to try to predict when and where earthquakes may occur, and as a result, lives can be saved.

Hence, earthquakes occur along cracks in the earth's surface, known as fault lines, and can be felt over wide areas, as mentioned in the third option.

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Is a spider unicellular or multicellular organisms

Answers

A spider is multicellular. Unicellular organisms are like bacteria.

A spider is multi-cellular because it doesn't have one cell.

Asexual reproduction in the parent cell will result in offspring with
A) similar genetic information.
B) half the genetic information.
C) double the genetic information.
D) four times the genetic information.

Answers

Technically, it would create an identical copy of the parent cell, but with the answers you gave me, I would have to say the first response. Sexual reproduction provides half the genetic information, a half from one parent and a half from the other.

I hope this helps!!!! :)

Correct answer: A). Similar genetic information.

Asexual reproduction is a mode of reproduction, which involves one parent and gives offspring that are genetically similar to each other and to their parents. It does not involve the fusion of male and female gamete.

It allows the plant to reproduce quickly, as a result of that the parent plant is compete-ting with their offspring for the same nutrient, sunlight, and space.

Example: Binary fission, fragmentation, vegetative propagation.

Which sentence describes an example of sublimation

Answers

The common example of sublimation is shrinking of ice cubes that are not used in the freezer and conversion of dry ice rapidly into wispy clouds which vanish very soon

is it more than one answer?

What happens to the thickness of the uterine lining when the level of progesterone reaches its highest levels?

Answers

the thickness of the uterine lining becomes very thick when the level of the hormone progesterone reaches its highest levels. this makes sense based on the function of progesterone, as it is necessary for the implantation of the zygote.

1. Describe how eukaryotic plant cells store and remove waste materials. (In a paragraph)

2. Describe how proteins are made, packaged, and transported within the cell. (In a paragraph)

Thank you!

Answers

1. The waste products of plant cells are carbon dioxide, water and oxygen. The carbon dioxide which is release during respiration is used up by photosynthesis process. The oxygen which is a by product of photosynthesis exist the plant cells through the stomata and root cell wall. Plant cells get rid of excess water via transpiration and guttation.
2. Protein synthesis within the cell is divided into two major phases, the transcription and the translation stages. In the transcription stage, the genetic information inside the DNA which is located inside the nucleus is transcribed into the mRNA, which then move out of the nucleus into the cytoplasm. In the cytoplasm, mRNA attached to the surface of the ribosomes and initiates the translation stage of protein synthesis. With the aid of tRNA and other elongation factors, a protein chain will be build up until a termination codon is reached, where the growing polypeptide chain will be terminated. The protein is then transported to the golgi apparatus which package the protein and send to the appropriate locations.

A new herbal supplement is on the market that claims to build immunity and prevent illness. The best response to this claim is to:
research the information using several sources before taking the supplement.
immediately begin the recommended regimen to stay healthy.
use the supplement when in close contact with others who are ill.
use half of a dose until more studies confirm the supplement’s effectiveness.

Answers

Answer:

The correct answer is research the information using several sources before taking the supplement.

Explanation:

Self medication is always harmful but if someone is in severe need then one can use the supplements for urgent use. Any supplement which is used without the recommendation of physician must be checked and authenticated from different sources before its consumption to avoid any harmful effects therefore option A is the correct option

the answer would be A. research the information using several sources before taking the supplement

Does H₂ have a coefficient?

Answers

H2 does not have a coefficient.
When writing chemical equations, coefficient refers to the numerical values written at the back of each compound, which show the number of molecule of each substance that is involved in the reaction. For instance, in 2H20, 2 is the cofficient, which tell us that two molecules of water is involved.
In the question given, the figure 2 attached to the symbol H is a subscript, which shows the number of atoms in the hydrogen molecule.

I do not understand any of this

Answers

ok go to the website and just plug in the information then fill in the little graph you were given. Then when your done putting it on the graph use the circle to make a circle graph using the data.

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