The front limbs of birds and bats -- both wings -- are considered to be:
a. homologous structures.
b. homozygous structures.
c. divergent structures.
d. vestigial structures.
e. homoplastic structures.
A
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The sulfur cycle is similar to the cycle of
A. carbon. B. oxygen. C. nitrogen. D. phosphorus.
The monomers of DNA, called ________, are composed of ________
a. amino acids / carbon, hydrogen, oxygen, and nitrogen b. monosaccharides / carbon, hydrogen, and oxygen c. nucleosides / base and sugar d. nucleotides / base, sugar, and phosphate
A bell-shaped curve of phenotypic variation is
indicative of a. incomplete dominance. b. continuous variation. c. multiple alleles. d. epistasis. e. environmental variables on phenotypes
About 2/3 of a shark's brain is used for:
a. control of body movement. b. processing electrical currents from the water. c. olfaction. d. vision. e. processing water pressure differences.