Which of the following is (are) NOT trend(s) of
vertebrate evolution?
a. conversion of the support for locomotion from
the notochord to the vertebral column
b. expansion of the nerve cord to form the brain
and spinal cord
c. changes in the respiratory system from gills to
lungs with accompanying changes in the
circulatory system
d. the development of fewer, more efficient
chambers in the heart
e. modification of limbs for more efficient
movement
Answer: d
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The primitive streak will develop directly into the
a. neural tube. b. embryonic disk. c. pharyngeal arches. d. somites. e. coelom.
In tidal pools,
A) oxygen concentrations are usually higher during the day than during the night. B) carbon dioxide concentrations are usually higher during the day than during the night. C) salinity is usually higher during the night than during the day. D) temperature is usually higher during the night than during the day.
Human skin color is thought to be determined by at least three pairs of alleles. If dark skin (D) is dominant to light skin (d), the genotypes that will produce the darkest skin are
A. D1d1 D2d2 D3d3. B. D1D1 D2d2 d3d3. C. d1d1 D2D2 D3d3. D. D1d1 D2d2 D3D3.
Which of the following is the purpose of using a control groups in an investigation?
a) to establish a standard for data comparison b) to provide the correct answer to an investigation c) to determine the dependent variables d) to function as a third variable group