Which is an example of a density-independent factor on a population?
A. weather
B. nesting sites
C. intraspecific competition
D. amount of prey
E. predation
A. weather
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To date, the most informative studies on how and to what degree heredity and the environment influence human traits have relied on data from
A) adopted children and their biological parents. B) monozygotic twins reared in the same environment. C) monozygotic twins separated at birth. D) Egyptian mummies.
Integration of sensory stimuli occurs in
A) highly specialized receptors such as the organ of Corti. B) all receptors. C) the brain. D) the central and peripheral nervous systems.
If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. Both the maternal and paternal plant must be variegated. D. The maternal plant must be variegated and the paternal plant can be any color. E. The maternal plant must be variegated and the paternal plant must be white.
Sections of the geologic timescale are defined by:
A) the age of the rocks. B) whether the rocks are metamorphic or sedimentary. C) how close the rocks are to the surface of the earth. D) the kinds of fossils present.