Parasitism
What will be an ideal response?
A relationship in which one organism, the parasite, depends on another, the host, for nourishment or some other benefit while simultaneously doing the host harm.
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Nellie and Phil experience weightlessness
A. in a freely-falling elevator. B. momentarily when they step off a high stair. C. in the absence of a supporting surface. D. all of the above
What two activities use the most water for a typical North American family of four?
A. dishes and drinking B. lawns and toilets C. bathing and cooking D. laundry and car washing
The Greek mathematician and geographer Eratosthenes is noted for
A) his highly precise maps of the coastlines of Mediterranean Europe and Africa. B) calculating Earth's diameter by measuring celestial angles at two different locations. C) inventing the concepts of time zones by dividing 360 by 24, thereby establishing 15° zones. D) being the first to realize the spherical shape of Earth E) reasoning that Earth's equatorial bulge was the result of Earth's rotation and centrifugal force.
Antidepressants such as Marplan do which of the following?
A) increase the activity of monoamine oxidases B) suppress the activity of monoamine oxidases C) suppress the G-protein-adenylate cyclase cascade D) suppress the synthesis of monoamine messengers