With ____ selection(s), the forms of a trait at

both extremes of a range of variation are
favored.



a. frequent
b. directional
c. disruptive
d. stabilizing
e. mutational


C

Biology & Microbiology

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What two hormones secreted from the pancreas maintain glucose homeostasis in vertebrates?

A. insulin and glucagon B. epinephrine and glucagon C. epinephrine and insulin D. cortisol and glucagon E. cortisol and insulin

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Which of the following is an example of a density-independent factor that affects population growth?

a. food availability b. disease c. earthquakes d. predation

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DNA is contained in the _____ of the cell nucleus.

a) proteins b) cytoplasm c) chromosomes d) RNA

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Viruses could not be seen until the invention of the electron microscope in ________

1713 1823 1932 1872

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