Explanation:
The experimenter alters the independent variable with the hopes of collecting data about how the dependent variable changes in response.Other variables have to be controlled so that any changes of the dependent variable are attributed to the known independent variable.
DNA is the ultimate control of cell's productions. So A.
Answer:
A. Some pea plants grow slowly and have few offspring
Explanation:
This contrast the reason why Mendel chose pea plants.
They grow rapidly and produce a lot of offspring.