_____ are the main organs in keeping water balance in mammals and birds.

Platelets are helpful in _____.

Which of the following body parts is about the size of a human fist?

Which blood vessels carry blood to the heart?

What is the principal function of digestive enzymes?

Almost half our blood consists of _____.

Living things come only from other _____.

DNA is a chemical found in the _____ of organisms.

After mitosis has occurred, _____ new cells have been formed.

Eggs and sperm are called _____.

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