As the global concentration of carbon dioxide increases, there is great potential for direct impact on the world's
A. climate.
B. biodiversity.
C. biogeochemistry.
D. ozone layer.
A. climate.
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Explain why organisms undergoing rapid evolutionary change often contain relatively large numbers of mobile DNA elements, whereas once organisms settle into a stable evolutionary niche, most of these mobile elements are lost
What will be an ideal response?
A patient visits a doctor complaining of a stomach infection. The patient insists that he be prescribed enough antibiotics to kill all of the bacteria in his intestines. Why is this a bad idea? (Select all correct choices.)
A. It's notâ€"any bacteria in his intestines will cause the patient to be sick. B. Such an antibiotic treatment could result in a serious C. difficile infection. C. Many intestinal bacteria are beneficial (they provide vitamins or break down cellulose).
Why is a pyramid of numbers for a forest sometimes narrow at the bottom?
a. Energy decreases as it passes through each trophic level. b. Energy increases as it passes through each trophic level. c. Individual producers are small and very numerous. d. Herbivorous insects vastly outnumber large producers. e. Large producers vastly outnumber insects.
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed
Give the phenotypes (with frequencies) of the offspring.