In order to have a negative population growth rate,
A. the birthrate must exceed the death rate.
B. the carrying capacity for the population must increase.
C. only replacement reproduction can occur.
D. the death rate must exceed the birth rate.
E. the biotic potential of the population must increase.
Answer: D
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A) in vitro B) in situ C) activity D) metagenomics
Which was an early tetrapod innovation?
a. limbs evolved from dorsal fins b. cartilaginous pectoral girdle c. four chambered heart d. stereoscopic vision e. inner ear changes to detect airborne sounds
Which of the following statements is true?
A) Fatty acids are synthesized by the stepwise addition of three carbon units. B) Unsaturated fatty acids are usually branched. C) Fatty acids with 24 carbons are most common. D) Saturated fatty acids have no double bonds between carbons. E) Hormones are unsaturated fatty acids.
Biogenesis states that life begins with
A. oceans. B. nonliving material. C. other living material. D. spontaneous generation.