What is a fossil? the remains of an animal or plant preserved within a layer of rock a large body of compacted ice formed over thousands of years the energy radiated from the Sun a change in the structure of Earth's surface

A. Is the correct answer!

Explanation: The remains of an animal or plant preserved within a layer of rock. have an amazing day <3

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225