Some of the "branches" of a phylogenetic tree do not extend to the end. What do these lines represent?
A) Extinct species
B) Species of unknown origin
C) Convergent species
D) Lineages that have not changed
A
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Glycogen is to animal cells as ________ is to plant cells.
A. lipid B. cellulose C. starch D. protein E. sugar
Chthamalus stellatus and Semibalanus balanoides do not coexist in the same tidal zones because
A. S. balanoides outcompetes C. stellatus. B. C. stellatus outcompetes S. balanoides. C. S. balanoides preys on C. stellatus. D. The two species require different resources.
Compared to mammals and reptiles, what characteristic prevents amphibians from surviving far from water?
A. Their limbs are too weak to support their weight on land. B. Their cartilaginous endoskeleton would dry out on land. C. They do not have any lungs and cannot breathe out of the water. D. Their eggs do not have an amnion to prevent them from drying out.
Reproduction of Komodo dragons by parthenogenesis involves
A) conjugation. B) transformation. C) self-fertilization. D) homologous recombination. E) spore formation.