Hoda, now pregnant, barbecued a shark that her uncle caught in a bay. Upstream from that bay was an old coal mine that was draining into the local river. What should you warn Hoda about?
What will be an ideal response?
The mine may be leaking mercury into the water. Sharks are high on the energy pyramid and naturally magnify nondegradable pollutants such as mercury. Pregnant women should be warned not to eat such fish.
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Respiratory syncytial virus is one of the most common etiologic agents of lower respiratory tract infection among:
a. previously healthy patients 2 months to 5 years of age. b. adults younger than 30 years of age. c. community-acquired pneumonia in adults. d. school-age children.
Essay on the Principle of Population, written by Thomas Malthus in 1798, influenced Darwin's thoughts as he struggled to understand what mechanisms could be at work to produce evolution. Malthus proposed that populations of animals and plants, including humans,
A. evolved from mainland to islands, thus explaining why the island flora and fauna resembled the mainland species so closely. B. decreased arithmetically in numbers while the nutrients available increased geometrically. C. increased arithmetically in numbers while the nutrients available only increased geometrically. D. increased geometrically in numbers while the nutrients available only increased arithmetically. E. increased geometrically in numbers while the nutrients available increased arithmetically.
The logic behind sequential polar body analysis is based on
A) Darwin's theory of natural selection. B) Mendel's law of segregation. C) Mendel's law of independent assortment. D) the rules of the genetic code.
If you cross RrYy and RRyy pea plants, what percentage of the offspring will have round yellow peas? R = round, r = wrinkled, Y = yellow, y = green.
A. 25% B. 100% C. 0% D. 75% E. 50%