How many factors does a scientist want to differ between the experimental and control groups? A) 2
B) 0
C) 1
D) 3

1 factor deffer which is independent variable which is controled in control groups

eukarya because is is like alche and b is bacteria and d is animals

explanation:

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )