The hosts for the causative agent of cholera
between El Niño Southern Oscillations are
a. humans.
b. algae.
c. copepods.
d. shellfish.
e. marine worms
C
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Of all the different types of plants, only _____________ are able to survive in the harsh environmental conditions of Antarctica
A. lycophytes B. gymnosperms C. angiosperms D. bryophytes E. ferns
An animal with bilateral symmetry
a. has left and right sides. b. usually displays cephalization. c. produces mirror images regardless of the number of "cuts" through the central axis. d. has left and right sides and usually displays cephalization. e. has left and right sides, usually displays cephalization, and produces mirror images regardless of the number of "cuts" through the central axis.
If a 10-mile-wide comet hit Earth, how would this likely affect the history of life?
A) Most species would become extinct, and the rest would remain more or less unchanged. B) A mass extinction would occur, followed by lots of evolutionary change among descendants of the survivors. C) A slow climate warming and drying would begin, decreasing the biological diversity on Earth. D) Continental drift would be reversed, and all the continents would slowly be pushed together again.
Challenges in developing effective antiviral drugs with minimal side effects to the patient include
A) only the attachment stage of the viral life cycle is a suitable target for antiviral drug action. B) viruses have many more chemically distinct targets than living pathogens. C) the immune system is rarely successful in ending viral infections so there is no natural model to work from. D) viruses use the cell's own machinery and metabolism for replication. E) drugs can be easily delivered to reach viruses within host cells.