Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment.
B) interactions among species have no significant influence on community structure.
C) when one species is removed, the populations of the other species are unaffected.
D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
D
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Frederick Law Olmsted, known as the father of American landscape architecture, is known for designing _________ and then becoming the original commissioner of _____________ National Park.
A. New York's Central Park, Yosemite B. Niagara Falls, Yellowstone C. Greek-style public gardens, Yellowstone D. Yellowstone National Park, Yosemite E. Chicago's City Parks, Yellowstone
Which is the correct sequence involved in the regulation of organ systems?
a. stimulus, receptor, integrator, response, effector b. stimulus, response, integrator, receptor, effector c. stimulus, receptor, integrator, effector, response d. stimulus, integrator, receptor, effector, response e. stimulus, effector, integrator, receptor, response
Monoclonal antibodies are useful in treating cancer when radioactive materials or tumor-killing drugs are attached to them. How is it that these cancer-killing methods are delivered only to the tumor and not to other, healthy cells?
A) Antibodies will specifically bind to the antigen target for which they are designed, here a cancer cell. B) Antibodies will attach to any cancer cell found, even if there are several different types present. C) Antibodies will stimulate the actions of T helper cells to fight the cancer. D) Antibodies will stimulate the actions of cytotoxic T cells to fight the cancer.
Pr strongly absorbs light having a wavelength of 730 nm. Indicate whether the statement is true or false