Which body part belongs to the circulatory system.
a. diaphragm
b. heart
c. trachea
d. kidney

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones? a) catalysis b) metabolism c) anabolism d) dehydration e) catabolism