Which is not a characteristic of living things?
a. organisms are made of cells.
b. organisms can adapt to changes.
c. organisms respond to changes.
d. organisms only need water.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the answer is c. altitude. hope this ! #brainiac

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 .