Combustion is another word for? A. Transportation
B. Respiration
C. Burning
D. Fossil Fuels

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

Viruses such as hiv reproduce rapidly. what is the connection between reproduction rate and evolution?