question... What ccurs when many muscles contract a little bit all at once?
Options:
- (A) heat production
- (B) heat loss
- (C) sweating
- (D) permineralization
- (E) hypothermia
- (F) resistance
- (G) cramping
- (H) heat energy
answer... Shivering occurs when many muscles contract a little bit all at once. Heat production is increased by shivering and non-shivering thermogenesis . Heat production occurs when many muscles contract a little bit all at once.
The answer is (A)

question... What do phytoplankton and algae need in order to make energy?
Options:
- (A) water
- (B) glucose
- (C) food
- (D) sunlight
- (E) bacteria
- (F) Light
- (G) adding heat
- (H) The Sun
answer... Phytoplankton are bacteria and algae that use sunlight to make food. Food gives energy. Phytoplankton and bacteria are algae that use sunlight to make energy.
The answer is (D)

question... Evolution over geologic time at the genus level and above is:
Options:
- (A) microcosm
- (B) genetic
- (C) Plants growth
- (D) macroevolution
- (E) natural selection
- (F) gastropod shells
- (G) peachleaf willow
- (H) Plant reproduction
answer...

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Macroevolution is evolution over geologic time above the level of the species. Besides the above-named species, various other species of the genus have been used medicinally. Macroevolution is evolution over geologic time at the genus level and above.
The answer is (D)