Question

describing the law of conservation of energy
the law of conservation of energy states that energy cannot be created or
however, energy can
from one substance to another.

Explanation:

The law of conservation of energy states that energy cannot be created or destroyed. Also, energy can be transferred from one form (not "substance"—maybe a typo, likely "form") to another. So the first blank is "destroyed" and the second is "transferred" (or if strictly following the text's "substance" error, but the correct term for energy transfer/transformation).

Answer:

First blank: destroyed; Second blank: transferred (Note: The original text has "substance" which is likely a typo, should be "form" for energy transformation/transfer.)