El Niño is a recurring weather phenomenon
that
a. increases global warming.
b. stabilizes world climates.
c. produces a fluctuation in global weather.
d. depletes the ozone layer.
e. increases oceanic productivity
C
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In vertebrates, external fertilization (select all correct choices):
A. is common among mammals. B. cannot occur in marine (salt water) conditions. C. is found in some fish and amphibians. D. involves releasing gametes directly into a wet environment. E. is a form of asexual reproduction.
The process by which chromosomes fail to separate during meiosis is called ____
a. aneuploidy
b. trisomy c. monosomy d. nondisjunction e. polyploidy
The fact that most segmentation genes code for ____ indicates that these protein products are ____ that regulate the
expression of other genes. a. homeobox genes; genetic switches b. transcription factors; genetic switches c. transcription factors; inducers d. maternal effect genes; protein switches e. hormones; signaling molecules
The probability of a hit is increased with _____ oxygen and _____ LET radiation.
a) high, low b) low, low c) high, high d) low, high