Answer:
Substance
<u>Review</u>:
⇒ One of a class of substances that cannot be separated into simpler substances by chemical means.
<u>Compound</u>:
⇒ A pure substance composed of two or more elements who composition is constant.
One type of density change is mass over volume.
It is the last choice because their similar bone structures suggest they once had a common ancestor, which is why they are all mammals.
True. feces, also known as excrement are the product of excretion.
