Biology Semester Review 4

Match it! Select the correct answer from the pull down...Good luck!

Platelets are helpful in _____.

DNA is a chemical found in the _____ of organisms.

Which blood vessels carry blood to the heart?

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

Eggs and sperm are called _____.

What is the principal function of digestive enzymes?

Living things come only from other _____.

Almost half our blood consists of _____.