In a controlled experiment, how many variables are changed/ manipulated
from the control group to form the experimental group?

A) no variables are changed
b) only one
c) two or more
d) all variables

i believe it is c: genes for body color and wing size are inherited separately from each parent.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .