Answer:
O H20 and CH4, but not O2
Explanation:
Compounds consist of multiple elements. O2 is just two oxygen atoms, meaning two atoms from the same element.
Bones and skull is the answer
False is your answer have a good day :)
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Answer:
Reproduction is important for the survival of all living things. Without a mechanism for reproduction, life would come to an end.
Explanation:
Reproduction is a characteristic of all living systems; because no individual organism lives forever, reproduction is essential to the continuation of every species.