Ques:[What stimulates the pituitary gland in order to maintain structural integrity of the thyroid?
Options:
- (A) TRH
- (B) Urea
- (C) CO 2
- (D) PDAs
- (E) HPV
- (F) SO2
- (G) mL
- (H) p53]
Ans:[TRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH. Another function of TSH is to maintain the structural integrity of the thyroid gland. TRH stimulates the pituitary gland to maintain structural integrity of the thyroid.
(A)]

Ques:[What do nephrons filter?
Options:
- (A) Blood
- (B) matter
- (C) solutes
- (D) Energy
- (E) SO2
- (F) Gases
- (G) Energy.
- (H) cations]
Ans:[Nephrons are the structural and functional units of the kidneys. Blood is filtered in the kidney. Nephrons filter blood.
(A)]

Ques:[What is a major food source for other organisms, including humans?
Options:
- (A) gastropod shells
- (B) orchids
- (C) invertebrates
- (D) swamp vegetation
- (E) Most plants
- (F) insects
- (G) barnacles
- (H) animals]
Ans:[Mollusks are a major food source for other organisms, including humans. Mollusks are invertebrates and are no exception. Invertebrates are a major food source for other organisms, including humans.
(C)]

Ques:[When does macroevolution over eras occur?
Options:
- (A) relocation
- (B) colder and wetter
- (C) in a few years
- (D) permineralization
- (E) over eras of time
- (F) within a lifetime
- (G) Continents drifting
- (H) in minutes]
Ans:
[Macroevolution is evolution over geologic time above the level of the species. Geologists break time down into geologic time units called eras . Macroevolution is evolution over eras above the level of the species.
(E)]