During which Period was there lush vegetation, the age of the dinosaurs and the break up of Pangea?
a. Cambrian
b. Mesozoic
c. Paleozoic
d. Jurassic
e. Cretaceous
d
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Photosynthesis in the ocean takes place mostly in the mesopelagic zone
Indicate whether the statement is true or false
To measure gene flow between populations, one must use genes for which the populations' frequencies
are significantly different. Indicate whether the statement is true or false.
Which of the following predictions is the most accurate about a person who has normal external barriers and specific internal defenses but lacks nonspecific internal defenses?
A) He will have many more infections than normal. B) He won't get sick because the external barriers will keep out pathogens. C) He won't get sick because the specific defenses will kill invading pathogens. D) Invading microbes will be able to enter through the respiratory tract.
Which vessels are structurally suited for the central purpose of allowing substances to pass in and out of them through their entire lengths?
A) capillaries B) arteries C) veins D) semilunar valves E) arterioles