Common forms of air pollution include smog, acid rain, greenhouse gases, and particulates. What is the main source of these pollutants?
a) burning fossil fuels
b) chlorofluorocarbons
c) hydrocarbons
d) eruption of volcanoes
Ans: a) burning fossil fuels
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A ________ mutation does not alter the amino acid sequence of the resulting protein.
A. nonsense B. silent C. missense D. None of the choices are correct.
How much of the available sunlight energy is usually converted into an ecosystem's gross primary productivity?
a. 1 % b. 2 % c. 5 % d. 10 % e. 25 %
Which of the following pairs indicates the closest
macroevolutionary link among the animals according to the evolutionary history tree in the text? a. flatworms; roundworms b. sponges; cnidarians c. arthropods; annelids d. arthropods; roundworms e. echinoderms; mollusks
The ________ connects the kidney to the bladder
A) collecting duct B) renal capsule C) urethra D) ureter E) fallopian tube