Over the last 400,000 years, how have atmospheric CO2 levels changed? Select all that apply
A. Atmospheric CO2 levels have remained
the same.
B. Atmospheric CO2 levels have been
steadily increasing overall.
C. Atmospheric CO2 levels have been
steadily decreasing overall.
D. Atmospheric CO2 levels have fluctuated
periodically.
D
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Can pollinator shifts enhance rates of species formation in plants?
A. yes B. no
Four of the five answers below are principal characteristics of all chordates. Select the exception
a. post-anal tail b. bony vertebra c. notochord d. dorsal nerve cord e. pharyngeal gill slits
When both alleles for a particular trait are expressed at the same time, we see an example of
a. incomplete dominance. b. simple dominance. c. recessivity. d. codominance. e. corecessivity.
Which of the following is NOT involved in the regulation of the lac operon?
A. an inducer B. a repressor protein C. an miRNA D. glucose E. cyclic AMP