In order for natural selection to occur within a population, certain conditions must be met. One such condition is
A. heterozygosity must be very low.
B. frequent mutations that are inherited.
C. phenotypic differences resulting from environmental conditions.
D. phenotypic variations that are genetic.
E. low rates of immigration.
D. phenotypic variations that are genetic.
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The long-term and short-term carbon cycles are connected by the fact that some of the carbon contained in C6H12O6 (or other organic molecules) in plants is incorporated into sedimentary rocks or oil;
it is not immediately reintroduced back into the atmosphere. A. true B. false
Which s elhants and crickets have in common?
A. DNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment. B. DNA nucleotides form the basis of all inherited life, with cells that are formed from other cells. C. RNA nucleotides form the basis of all inherited life, with cells that are formed from other cells. D. RNA nucleotides form the basis of inherited life, with cells that are formed spontaneously from the environment.
The cells of reef-building corals are inhabited by symbiotic species of
A) algae. B) fungi. C) bacteria. D) cyanobacteria.
The job of this organ is to cleanse the blood of pathogens and worn-out or damaged RBCs.
A. tonsils B. nodes C. liver D. alveolus