Why have growth rates increased the most in developing countries in the past 50 years?
A. Individuals in the population are living longer lives.
B. Death rates have decreased as compared to birthrates.
C. Death rates have increased as compared to birthrates.
D. Individuals in the population are living shorter lives.
E. Death rates are equal to birthrates.
B. Death rates have decreased as compared to birthrates.
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The most important concept in the field of population genetics is
A. natural selection. B. population size. C. rates of mutation. D. genetic variation. E. phenotypic variation.
Answer the following statements true (T) or false (F)
1. All rain forests are tropical. 2. The same biome cannot occur on more than one continent. 3. The range of the sugar maple could decrease in response to warming due to climate change. 4. The number of aquatic species increases in acidic waters.
Chelicerae function as
A. eyes. B. fangs or pincers. C. jaws or mandibles. D. teeth. E. wings.
Four of the five choices listed below are steps in the
process of transcription. Select the exception. a. cap put on one end b. introns snipped out c. action by DNA polymerase d. poly-A tail placed on one end e. exons spliced together