Answer:
identify the variables
Explanation:
control:type of lemon used
dependent:whether apple slice turns brown at pH>2
independent:pH value
The answer is d. chromosomes help an organism produce usable energy
D i think because A has nothing to do with behavioral adaptations, B is normal for horses has nothing to do with behavioral adaptations, C is how they eat of coarse, It has to be D
a group of cells that are similar in function, structure and origin.
