When conducting descriptive research, a scientist primarily uses:
a. control data.
b. data.
c. experiments.
d. observational data.
e. experimental data.
D
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Which of the following is NOT found in hydrocarbons?
a. branching b. double bonds c. ring formation d. triple bonds e. quadruple bonds
Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem c. the concentration of nondegradable poisons within organisms at higher trophic levels d. the concentration of degradable poisons within organisms at lower trophic levels e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared to those at lower trophic levels
At the end of the experiment, the bacteria
a. were evenly distributed throughout the chamber. b. were clustered on the algal filament. c. were clumped along certain areas of the algal filament. d. were actively avoiding the algal filament.
Which of the following does NOT promote
speciation? a. gamete differences b. gene flow c. season of fertility d. natural selection e. genetic drift