A portal system is _____
A) an area connecting arterioles to venules
B) a series of vessels that returns blood to the heart in an animal with an open circulatory system
C) a space within or between organs where blood is allowed to pool
D) a slightly muscular vessel that has minimal pumping action in an organism with no heart
E) a vessel or vessels connecting two capillary beds
Answer: E
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Which statement is true for scyphozoan medusae?
(a) They are the dominant body form. (b) They are generally smaller than hydrozoan medusae. (c) Most live in freshwater. (d) They are scavengers.
The overall results represented in Figure 18.7 suggest that offspring exhibit an average phenotype that is more different from the population mean than that of their parents
A. true B. false
Within the peptidoglycan layer, the crossbridges that connect the chains of alternating sugar molecules extend between _______ .
a) two N-acetylmuramic acid molecules b) an N-acetylmuramic acid and an N-acetylglucosamine c) two glucose molecules d) two N-acetylglucosamine molecules
In what way are herbivores and carnivores alike?
a) they both directly consume producers b) they both use photosynthesis to make their own food c) they both are considered to be autotrophs d) they both obtain energy by consuming other organisms