The answer to this would be reactants.
Answer:
By domesticting plants and animals, humans were able to modify the plants and animals to suit their needs.
Explanation:
Early humans didn't know that domesticting and manipulating plants and animals is explained through biology, nor did they have the term "biology", however, domestication certainly contributed to people becoming curious as to how and why these processes worked.
So the independent variable is the thing that is changed in an experiment and you want to change the amount of rainfall the cactus gets as the hypothesis is about rainfall so the answer would be c). Hope this helps :)
D. in the nucleus
the process of making mRNA from DNA is called transcription, it occurs in the nucleus
