Three species of tigers have gone extinct due to overharvesting or habitat destruction. This is an example of
A. mass extinction.
B. adaptive radiation.
C. sympatric speciation.
D. increased extinction rate by human activity.
E. background extinction rate.
D. increased extinction rate by human activity.
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Double fertilization in angiosperms results in:
A. a diploid embryo and a diploid endosperm. B. a diploid embryo and a triploid endosperm. C. a triploid embryo and a diploid endosperm. D. a diploid embryo and a haploid endosperm. E. a haploid embryo and a haploid endosperm.
The best way to prevent desertification is to avoid farming in areas that are subject to __________. Fill in the blank(s) with the appropriate word(s)
In order to activate genes associated with lactose metabolism, the levels of cAMP must be ________ in a bacterial cell
Fill in the blank with correct word.
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Figure 33.8
Use the accompanying figure to answer the following question.
What letter indicates a taste bud?
A. A B. B C. C D. A and B E. None of these, because they are olfactory receptors