Blood is carried from the heart to the lungs by the
A. aorta.
B. pulmonary artery.
C. pulmonary veins.
D. vena cava.
B. pulmonary artery.
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Based on the theory of natural selection, if an allele is disadvantageous to a population, how could one expect the frequency of that allele to change over time?
a. the frequency of the disadvantageous allele would increase over time b. the frequency of the disadvantageous allele would decrease over time c. the frequency of the disadvantageous allele would not change over time d. it is impossible to determine how the allele frequency would change over time
What evidence supports the idea that some nuclei are totipotent?
a. Nuclei taken from the cells of an embryonic frog can direct a frog egg to develop into a tadpole. b. Nuclei taken from the cells of a frog embryo can direct any amphibian egg to develop into a tadpole. c. Nuclei taken from a different species can direct a tadpole egg to develop into a normal tadpole. d. Some cells are capable of undergoing unlimited cell cycles.
e. Some cells are capable of arresting their cell cycle at will.Which of the following can contribute to density-dependent regulation of populations?
A) the removal of toxic waste by decomposers B) intraspecific competition for nutrients C) earthquakes D) floods E) weather catastrophes
The taxonomic science that stresses the presence of shared derived characters in related organisms is called ________
Fill in the blank(s) with correct word