An infection caused by an opportunistic microbe after a primary infection has weakened the host's defenses is a ________ _________.
Fill in the blank(s) with the appropriate word(s).
Ans: secondary infection
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Which part(s) of the brain, when impaired by alcohol, play an important role in memory:
A. Nucleus accumbens
B. Hypothalamus
C. Hippocampus
D. All of the above
The fins of bony fishes are more maneuverable than those of cartilaginous fishes
Indicate whether the statement is true or false
Which type of plant hormone is a gas at normal temperature and pressure?
a. abscisic acid b. ethylene c. auxin d. salicylic acid e. systemin
When one tallies the species in a community by numbers of individuals, one typically finds that:
A) all species have about the same number of individuals. B) most species are dominant, whereas a few others are represented by relatively few individuals. C) a few species are dominant, whereas most others are represented by relatively few individuals. D) there is no general pattern in the relative abundances of species.