Most of the water vapor in the earth's
atmosphere comes from evaporation from
a. lakes.
b. rivers.
c. land.
d. oceans.
e. plants.
D
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A water molecule is polar because
a. the oxygen atom is a negative ion and the hydrogen atoms are positive ions. b. both the oxygen and the hydrogens are negatively charged. c. oxygen has a magnetic charge. d. the electrons of the hydrogen atoms are pulled to the oxygen atom. e. hydrogen has a stronger pull on the electrons than does oxygen
Which statement illustrates Lamarck's theory on the mechanism of evolution?
A) A man who routinely shaves the hair off his head will have sons who become bald. B) Fish with coloration that matches the river bottom they inhabit will survive to reproduce. C) Plants that can survive in less light will become the dominant species in shaded areas. D) Giraffes with longer necks survived and reproduced faster because they could reach a better food source. E) Birds with bright colors will attract more mates and pass on the colorful plumage.
Directional, light-triggered plant development is known as
A. phototropism. B. thigmonasty. C. thigmotropism. D. acid-growth movement. E. photomorphogenesis.
When a spermatogonium divides, it produces one primary spermatocyte and:
A) one nurse cell. B) two secondary spermatocytes. C) one spermatogonium. D) one spermatid.