The limnetic zone is indicated by
a. A.
b. B.
c. C.
d. D.
e. none of these.
B
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Choose the true statements about the evolution of complex characters, such as powered flight.
_____ Phylogenetic analysis using cladistics can help reveal the sequence leading to the evolution of a complex character. _____ Usually a single mutation in one gene leads to the simultaneous appearance of the complex character. _____ Often the initial stage in the evolution of a complex character was an adaptation to some unrelated selection pressure. _____ The intermediate stages in the evolution of a complex character had no fitness advantage.
Activation energy is best described as ________
a. the difference in the energy level of the reactants and the energy level of the products b. the minimum amount of energy it takes to get a reaction started c. the proportion of the energy released by an endergonic reaction that can be captured by ATP d. the minimum amount of energy a reaction produces once it gets started
Most members of the lineage ____ are terrestrial earthworms
a. Hirudinea b. Polychaeta c. Monogenoidea d. Cestoda e. Oligochaeta
What adaptation is found in the evergreen trees of boreal forests?
A) a thick waxy coat on leaves B) lower levels of chlorophyll in leaves C) the ability to shed leaves when water availability is low in winter D) flower production in early spring