The increasing rate of population growth over the past 50 years is the result of:
a. increasing birth rates in the developed countries
b. increasing birth rates in the developing countries
c. decreasing mortality rates in the less developed countries
d. increasing mortality rates in the less developed countries
c
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Variation is always present in populations because ____
a. alleles control multiple genes b. genes blend during inheritance c. alleles blend during inheritance d. genes are reshuffled by reproduction and altered by mutations e. new traits develop when traits that are not expressed are lost
Macroalgae/seaweeds can be best differentiated from true plants because macroalgae/seaweeds ________.
A. are photosynthetic B. are prokaryotic C. have no true roots, leaves, or stems D. are mostly unicellular E. have no chlorophyll
The four outer (giant) planets are composed largely of ________.
A. ammonia B. hydrogen C. carbon dioxide D. water vapor E. nitrogen
The doubling time for a population with an annual percentage growth rate of 7.0% is
A. 50 years B. 10 years C. 1 year D. 5 years E. 100 years