Which statement is NOT true?
a. Electrons closest to the nucleus are at the
lowest energy level.
b. No more than two electrons can occupy a
single orbital.
c. Electrons are unable to move out of the
assigned orbital space.
d. The innermost orbital holds two electrons.
e. At the second energy level there are four
possible orbitals with a total of eight
electrons
C
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Balanced polymorphism in a population is likely the result of
a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.
Megakaryocytes fragment to produce
a. red blood cells. b. lymphocytes. c. platelets. d. eosinophils. e. neutrophils.
A shark is a(n)
A) invertebrate chordate. B) amphibian. C) cartilaginous fish. D) jawless fish. E) bony fish.
Which of the following types of microbes might be found in a boiling hot spring?
A) hyperthermophiles B) phototrophic bacteria C) methanogens D) non-thermophiles E) halophiles