Four of the five answers below are explanations of why the fossil record is incomplete. Select the exception
a. very few organisms were preserved as fossils.
b. organisms tend to decay before becoming a fossil.
c. animals with hard parts are preserved more easily.
d. geological processes may destroy fossils.
e. organisms that were widely distributed would lead to less fossils.
e
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Which vessel type regulates the amount of blood a particular area receives?
a. arteries b. arterioles c. capillaries d. venules e. veins
Secondary cell walls are stronger than primary cell walls because secondary cell walls contain
a. more pectin. b. less lignin. c. more chitin d. more lignin e. layers of cellulose fibrils at various orientations to one another.
It is estimated that as much as ________ of the cycling nitrogen in the oceans is contributed by anammox bacteria.
A. 70% B. 40% C. 10% D. 25%
Which of the following is a reason for the occurrence of a lag phase in a bacterial growth curve?
A. The organisms may have been injured and require time to recover. B. The medium may be different from the previous growth medium so that the cells must synthesize new enzymes to use different nutrients. C. The cells may be old and depleted of ATP, essential cofactors, and ribosomes that must be synthesized before growth can begin. D. All of these are potential reasons.