The three types of survivorship curves are idealized situations. What type of curve probably happens more frequently in nature?
What will be an ideal response?
Nature does not tend to favor the survival of the very young or small members of a population, so there is likely a high mortality in the juvenile segment of many natural populations. This would be followed by a more stable, but declining, rate of survival throughout the reproductive years. At the end of the curve, a sharp drop occurs when organisms reach the physiological limit of their life spans.
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A ________ is a complex of RNA and protein that serves to remove introns from pre-mRNA.
Fill in the blank(s) with the appropriate word(s).
A(n) ________ is an example of a mollusc that does not have a shell
A) octopus B) snail C) spider D) oyster
The internal temperature of mammals is maintained within a narrow range; to do so, mammals must have _____.
A) receptors sensitive to temperature B) cells that absorb excess heat C) circulating chemicals in the blood that tell cells when to absorb or release heat D) molecules that are activated by changes in temperature E) all of the choices
Identify the structure of the neuron marked D
a. axon terminal b. cell body c. axon d. glial cell e. dendrites