The moraines left when glaciers retreat are characterized by
A. year-round ice.
B. low nitrogen content and little organic matter.
C. rich, fertile soil.
D. high levels of nitrogen, phosphate and carbon.
B. low nitrogen content and little organic matter.
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Water molds are
a. parasites of fish and invertebrates. b. the cause of late blight of potatoes. c. the cause of sudden oak death. d. responsible for the destruction of cucumber, squash, and other crops. e. all of these.
Class II MHC genes encode glycoproteins on the surface of cells that bind with antigen from
intracellular pathogens. ____________________ Indicate whether the statement is true or false.
A rescue effect occurs when:
a. lost genetic variation of a population is restored by immigration b. genetic variation is maintained by immigration c. large genetic variation is decreased due to fragmentation d. lost genetic variation of a population is restored by an invasive species e. when individuals of different species reproduce
How does Salmonella grow in host cells? How does it differ from Shigella?
What will be an ideal response?