Which of the following best describes the period during which the developing offspring is considered a fetus?
A) the first trimester only
B) the third trimester only
C) from fertilization to three weeks
D) from nine weeks until birth
E) from fertilization to eight weeks
Answer: D
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Most bacterial cells keep from bursting in a hypotonic environment by:
a. an efficient water pump. b. a tough cell membrane. c. pumping large quantities of salts into the cell. d. a rigid cell wall. e. a stiff capsule.
What benefit do animals get from having very long loops of the nephron?
A) They can send more glucose back to circulation. B) They make less nitrogenous waste products. C) They can send more water back to circulation. D) They can excrete more salt.
Epithelial tissue is least likely to:
a. contract. b. be specialized as sensory receptors. c. provide protection. d. regulate exchange of substances between parts of the body. e. produce and secrete cell products.
Of the following, the most important cause of deforestation is ________
A) fires caused by lightening B) city expansion C) farming D) continental drift