Most of the frozen ice in a comet's vaporizes after the comet's many trips around the sun.
a.
coma
c.
heart
b.
tail
d.
nucleus

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.

Explain the significance of the increased cell specialization of the volvocine line