Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with ________ in Africa.
A. humans
B. plants
C. parasites
D. diseases
Answer: A
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Plasma will make up ________% to ________% of the blood volume
a. 40, 50 b. 60, 70 c. 50, 60 d. 80,90 e. 20, 30
What is true of the trait whose frequency distribution in a large population appears above? It has probably undergone
A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) random selection.
Tapeworms are similar to fungi in that they
A) have cell walls made of chitin. B) are sessile autotrophs. C) feed by absorption. D) inhabit marine, damp terrestrial, and freshwater habitats.
Prior to secretion, Gram-negative bacterial proteins are translocated across one membrane while Gram-positive proteins are translocated across two membranes.
Answer the following statement true (T) or false (F)