Why do frequent moderate intensity disturbances increase species richness?
What will be an ideal response?
ANSWER: According to the intermediate disturbance hypothesis, species richness is greatest in
communities that experience fairly frequent disturbances of moderate intensity. Moderate
disturbances create some openings for r-selected species to arrive and join the community,
but they allow K-selected species to survive. Thus, communities that experience intermediate
levels of disturbance contain a rich mixture of species.
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In a two-point test-cross analysis, a dihybrid F1 fly is crossed to a __________
A) pure-breeding mate with a dominant phenotype (AABB) B) pure-breeding mate with a recessive phenotype (aabb) C) heterozygote mate (AaBb) D) mate that is dominant for one gene and recessive for the other (AAbb or aaBB) E) second dihybrid F1 fly (sibling cross)
Describe the problems that are associated with the loss of the epidermal layer of skin due to a burn.
What will be an ideal response?
The most precise method of obtaining estimates of the absolute ages of geological deposits is to
A. apply the principle of superposition (younger deposits above older deposits). B. measure the ratios of various radioactive isotopes in the deposits. C. measure rates of sedimentary rock formation. D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
You have a substance and begin a set of experiments in which you break it down into other substances through chemical reactions. After a few successive reactions, you discover a set of products that can't be broken down further, no matter what type of
chemical reaction you attempt. These substances are: A) elements. B) neutrons. C) isotopes. D) protons. E) electrons.