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barxatty [35]
3 years ago
11

A scientist testing the effects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not rece

ive the chemical. In the fall, the number of apples harvested from each forest is counted.
Which of the following is the independent variable in the experiment?
1.the amount of water that each orchard receives
2. the species of trees in the orchard
3.the number of apples that are produced by each tree
4.the size of each of the orchards
Biology
1 answer:
Gekata [30.6K]3 years ago
4 0

Answer:

None of the given options

Explanation:

An independent variable is the one whose quantity or specification is varied during an experiment in order to test the impact of the variation of independent variable on the dependent variable. From the description provided it is clear that the yield of apple is the dependent variable while the chemical is the independent variable. The application of chemical is varied on the two sets of apple gardens.  

Hence, among the given options none is correct

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Blood pumps through arteries due to contraction of the arterial walls but flows more freely through veins because there is littl
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Excitable cells like those found in muscle tissue are expected to be present in higher quantities in arteries than in veins.

<h3>What are Excitable cells?</h3>

Excitable cells are defined as those cells that are capable of generating electrical impulses when stimulated. Example of such cells include:

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