Levi decides to examine the effect of fertilizer on the growth of tomato plants. he chooses four plants for his experiment and applies varying amounts of fertilizer to the three of them. he does not apply fertilizer to one plant over a 15-day period, the plants receive fertilizer on days 1,4,7,10, and 13. levi measures the height of all of his plants with a meterstick on days 3, 6, 9, 12, and 15. he also makes sure to hold all experimental factors constant except for the fertilizer. what is the independent variable in levi's experiment on tomato plants?
a. the days plant height was measured
b. the measurements of plant height
c. the days fertilizer was applied
d. the amount of fertilizer given to the plants

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explanation:

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high growth (apex)

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.

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