You have been working with a marine biologist on a trip from Baltimore through the Chesapeake Bay, to the open ocean, and back to test salinity levels and the kinds of plankton that live in each sampled area. The marine biologist is very nearsighted and
she cannot see more than a few feet without the eyeglasses she lost two days ago when out on the open ocean. She arises one morning late in the trip, with no idea where the ship is. But after an hour of hearing you report salinity readings that vary by as much as 1 percent, she says, "So, we're in the Chesapeake Bay?" How did she (correctly) make that conclusion based on the information provided?
What will be an ideal response?
Estuaries such as the Chesapeake Bay are the only marine environments where salinity varies so much.
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A group of individuals that can interbreed in nature and produce viable offspring would be considered to be a species according to the
A. phylogenetic species concept. B. biological species concept. C. evolutionary species concept. D. ecological species concept. E. general lineage concept.
Metanephridial organs are common in:
a. mollusks. b. flatworms. c. cnidarians. d. sponges. e. insects
Define natural selection.
What will be an ideal response?
Unlike an anion, a cation has a(n) _____.
A) negative charge B) positive charge C) neutral charge D) electric charge