In the logistic growth model, as the number of individuals in the population (N) approaches the carrying capacity (K), what happens to the intrinsic rate of growth (ri)?
A. It will be affected by an increased birth rate.
B. It will be affected by a decreased death rate from predation.
C. It will be affected by increased competition with other species.
D. It will be affected by increased competition within the species.
E. It will not change.
E. It will not change.
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Environmental air temperature can fluctuate many degrees during the course of a day. A human's body temperature
A. can also fluctuate many degrees. B. must be maintained within a range of a few degrees. C. is raised by sweating and dilation of blood vessels in the skin. D. is not maintained internally but fluctuates with the air temperature. E. is lowered by shivering.
Invertebrates that feed on the algal coating of stones and rubble in streams and rivers are referred to as ________
Fill in the blank(s) with correct word
Before Mendel, most people would have predicted that a cross of a red rose with a yellow rose would
produce ____. A. all red roses B. all yellow roses C. all orange roses D. about half yellow roses and half red roses E. about three-fourths red roses and one-fourth yellow roses
Over the past 400 years, humans have documented the extinction of more than ________ species. This modern rate of species extinction is estimated to be ________ the normal extinction rate seen in the fossil record
A) 100; about the same as B) 400; about double C) 1,000; over 100 times greater than D) 10,000; at least 1 million times greater than