Why did internal fertilization likely evolve?
A. As an adaptation to life in a terrestrial environment.
B. To increase the chances of successful fertilization.
C. Because there were no safe places to lay eggs.
D. As a response to copulation.
Answer: A
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Match the following items with the correct phrases.
_______1. Diseases that are always present in a population are known as ____________________. _______2. Diseases that are transmissible from person to person are known as ____________________. _______3. Diseases that occur only occasionally in a particular population are known as ____________________. _______4. Because large numbers of cases of AIDS, malaria, and tuberculosis are presently occurring in many different countries, they are known as ____________________. _______5. Diseases with unusually high numbers of cases that often occur in one particular geographic location are known as ____________________. a. communicable diseases b. endemic diseases c. epidemic diseases d. pandemic diseases e. sporadic diseases
Maureen Stanton and colleagues (1986 ), experimenting with wild radishes (Raphanus raphanistrum), demonstrated that sexual selection on male flowers has led to ________
A) many small flowers that attract male pollinators B) showy flowers that attract male pollinators C) flowers with large nectar-producing glands to attract male pollinators D) flowers where male and female flowers appear on the same plant
During the early stages of sporulation in Bacillus subtilis, ________ is active in the forespore and ________ is active in the mother cell.
A. ?K; ?F B. ?E; ?F C. ?F; ?K D. ?F; ?E
An obligate anaerobe is an organism that:
A. does not use oxygen but is not poisoned by it B. requires oxygen C. is poisoned by oxygen D. can use oxygen but can get along without it E. produces oxygen