Judge the following sentence according to the criteria given below: Reef-building corals are not able to survive in nutrient-poor tropical waters BECAUSE they receive most of their nutrition from symbiotic zooxanthellae algae
A) The assertion and the reason are both correct, and the reason is valid.
B) The assertion and the reason are both correct, but the reason is invalid.
C) The assertion is correct, but the reason is incorrect.
D) The assertion is incorrect, but the reason is correct.
E) Both the assertion and the reason are incorrect.
D
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The term half-life represents the time it takes
A) to dissolve half of the atoms in the lattice. B) for the parent atoms to decay into atoms half their original size. C) for half of the parent atoms to decay into daughter atoms. D) for the Sun to decrease its size by 50 percent.
Why is the Ogallala aquifer so important?
a) it feeds springs for the largest trout farms in the world b) it is an important source of irrigation c) it is an important source of coal and hydroelectric power d) radioactive waste has been buried along the eastern side and is leaking e) all of the above are correct answer
Solid-waste disposal prior to 1960 was mostly about the
A) sanitary treatment of sewage from cities and towns. B) safe storage of radioactive wastes. C) removal of topsoil contaminated by chemical spills. D) disposal of household and commercial garbage.
In the United States educational services account for about ________ percent of jobs
A) 10 B) 2 C) 1 D) 35 E) 25