The presence of an El Niño event may produce damaging __________ changes in a coral reef
a. chemical
b. pH (a measure of acidity)
c. temperature
d. None of these answers is correct
C
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Which of the following describe the integumentary system?
A. Smooth and skeletal muscles B. Stomach, liver, intestines C. Heart and blood vessels D. Skin, nails, hair
During the light reaction water is oxidized to form oxygen. This process
A. yields low-energy electrons. B. yields high-energy electrons. C. is needed to replace the electron lost by P680 during the light reaction. D. yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction. E. yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.
Which of the following can make it easier to see the internal parts of a cell through a light microscope?
a. Beams of electrons b. Stronger lenses c. Direct source of natural light d. Special stains
Fever is caused by
A) increased blood flow to the brain. B) the release of histamine by damaged cells. C) the effect of pyrogens on the hypothalamus. D) decreased white blood cell count in the bloodstream.