The answer is d because it said so
Answer:
A compound is a pure substance that is composed of elements chemically bonded in definite proportions. A compound can be broken down into simpler substances only by chemical reactions, such as electrolysis. A solution is a homogeneous mixture, meaning that it is the same throughout.
Explanation:
.
Answer:
A channel in an ancient Martian "river bed" was not carved out by liquid water but built by molten lava
