CO2 and other gases, which absorb the longer wavelengths of infrared light and radiated heat from Earth, are responsible for causing the
A. ozone layer depletion.
B. acid rain.
C. decreased biodiversity.
D. greenhouse effect.
Answer: D
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Genetic maps are based on recombination frequencies. Because both odd and even numbers of crossovers can occur between any two gene loci, as the physical distance between two loci increases, the maximum recombination frequency levels off at 50%. However, suppose you discovered a species where only an even number of crossovers can occur between any two gene loci. In this case, as the physical distance between two loci increases, you would expect the maximum recombination frequency to
A. remain at zero. B. increase with no limit. C. level off at 25%. D. level off at 75%. E. level off at 100%. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about recombination frequency? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Why is more than one sperm needed for fertilization to occur, when only one sperm actually penetrates the egg?
a. the sperm work together to lower the acidity in the uterus for survival b. the sperm work together reduce drag as they swim up the oviduct c. the sperm work together to surround the egg prior to fertilization d. the sperm work together to break down the egg's protein layer e. the sperm work together to break down the cap on the sperm's head
Protons = 7, neutrons = 10, electrons = 7. The mass number of this atom is
A. seven. B. ten. C. fourteen. D. seventeen.
Let Y1i be the output for factory i when it receives a new machine, and let Y0i be the output for factory i when it does not receive a new machine. Also let Yi be the realized output for factory i and let Di be a binary variable that equals one if factory i actually received a new machine. If the company's headquarters randomly assigns new machines to a subset of the company's factories, this ensures:
A. E(Yi|Di = 0) - E(Yi|Di = 1) = E(Y1i - Y0i) B. E(Yi|Di = 1) - E(Yi|Di = 0) = E(Y1i - Y0i) C. E(Yi|Di = 1) = E(Yi|Di = 0) D. E(Yi|Di = 1) = E(Y1i - Y0i)