The answer is A, the screw and lever. Hope you do well
Somatic cells best describe your skin and stuff
Answer:
Independent: type of fertilizer
dependent: plant growth
control: soil, seed, water, type of pot, environment/amount of sunlight, air quality, etc.
Explanation: Think about it like this: the dependent variable DEPENDS on the independent variable. The fertilizer will control how tall the plant grows (if there is a relationship between them). Then the control variable is ANY VARIABLE that remains the same in all trials. You can only manipulate one variable (have one independent variable) or else the experiment is not valid.
Blood has further to travel in larger, more complex animals
