Researchers studying guppies in Trinidad found that guppies, in streams with high predation, reproduce earlier and more frequently. How would the scientists describe the selective force acting on the guppy population?
A. r-selection
B. sexual selection
C. density-dependent factors
D. density-independent factors
E. K-selection
A. r-selection
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The Golden Age of Medical Microbiology
A. occurred during the late 1800s to early 1900s. B. started in the 1990s with the advent of genetic engineering. C. is a time when the knowledge of and techniques to work with bacteria blossomed. D. was when people realized that diseases could be caused by invisible agents. E. occurred during the late 1800s to early 1900s, is a time when the knowledge of and techniques to work with bacteria blossomed AND was when people realized that diseases could be caused by invisible agents.
Which glial cell(s) is/are only found in the peripheral nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. microglia e. saltatory cells
Which of the following describe(s) conotoxins?
a. up to 300 different types b. delivered by a harpoon-like device c. very specific effects d. affect membrane proteins e. all of these
The fermentation by-products of Clostridium perfringens can destroy muscle structure in myonecrosis.
a. true b. false