Select all the ways lymph moves in one direction through lympatic vessels. Select all that apply
A) skeletal muscle contraction
B) presence of one-way valves
C) pumping of the heart
D) movement of synergistic bacteria
Answer:
A) skeletal muscle contraction
B) presence of one-way valves
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The primary lipid components of the membranes of extreme thermophiles are ________.
A. C20 diglycerol diethers B. sulfolipids C. cholesterol D. C40 isoprenoid tetraethers
Which populations are at greatest risk for extinction?
A) very small ones B) very large ones C) ones with specific niches D) ones with extensive habitat ranges
Based on Figure 52-3, when prey are abundant the most effective hunting group size is:
a. 1. b. 3. c. 4. d. 5. e. 7.
Many fern gametophytes are hermaphrodites, meaning they can produce both sperm and egg. Why is this necessary for a fern, but not for an angiosperm?
A. If one seed colonizes a new habitat, reproduction can occur in later stages. B. The gametophyte can produce multiple types of spores. C. The gametophyte can produce multiple types of seeds. D. If one spore colonizes a new habitat, reproduction can occur in later stages. E. Angiosperm gametes are diploid.