When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of
A) density-dependent regulation.
B) exotic regulation.
C) ecosystem carrying capacity.
D) density-independent regulation.
E) community carrying capacity.
A
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Crocodiles are living representatives of ____
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. dinosaurs
The entire genome of an organism is present in each of its cells, for example, in neurons, muscle cells, and skin cells in mammals.
Answer the following statement true (T) or false (F)
Pathogens must be blood-borne in order to initiate sepsis
Indicate whether the statement is true or false
Which of the following circumstances is/are of concern in an attempt to fulfill Koch's postulates?
a. Infected animals do not show the same symptoms as infected humans. b. The suspected pathogen is present in healthy humans. c. An axenic (or "pure") culture cannot be obtained. d. All of the above are of concern.