A tropical biome dominated by grasses with a few scattered shrubs and trees is known as a ____.

A) warm desert
B) savanna
C) tundra
D) taiga
E) chaparral

(1) pH in the stomach during digestion
(2) pH in the duodenum during digestion

A) First item is greater than the second item.
B) First item is less than the second item.
C) First item is equal or nearly equal to the second item.

When the upper epilimnion waters become cooler than the hypolimnion waters, and the surface water sinks while the deeper water rises is known as

A) intertidal zonation.
B) upwelling.
C) pelagic division.
D) overturn.
E) eutrophication.

Which of the following is true during the resting membrane potential?

A) Sodium ion concentration is greater inside cells.
B) Negatively charged proteins are more concentrated outside the cell.
C) A greater concentration of calcium ions is found inside the cell.
D) Potassium is concentrated primarily inside the cell.
E) None of these choices reflect what occurs during the resting membrane potential.

Which organ is NOT part of the endocrine system?

A) gonads
B) adrenal glands
C) lymph node
D) thymus

Most scientists believe that the dinosaurs went extinct due to ____.

A) runaway global warming
B) competition from early mammals
C) a meteorite impact
D) a pandemic disease
E) unknown causes