Which of the following best describes the function of the sympathetic nervous system?
a. it creates equilibrium in the body.
b. it arouses the body and expends energy.
c. it raises the energy level of the body.
d. it calms the body and conserves energy.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.