Which of the following is a positive numerical response of a predator in response to an increase in prey density?
A) decrease in predator mortality rate
B) increase in predator survival rate
C) immigration of predators to an area of high prey density
D) decrease in predator reproduction rate
C
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The existence of extensive scalded skin syndrome does not indicate that Staphylococcus is growing in all the affected areas. Why not?
A. This condition is caused by an exotoxin produced by certain strains of this microbe, and NOT directly by the microbe itself. B. This condition is caused by an endotoxin produced by certain strains of this microbe, and NOT directly by the microbe itself. C. This condition isn't caused by Staphylococcus at all. D. This microbe doesn't grow in the skin-but the toxins it releases are transported by the blood vessels into the skin, where it achieves the observed effect.
The type of skeleton that consists of fluid constrained within a layer of flexible tissue is a(n)
A. vascular canal. B. endoskeleton. C. gastrovascular cavity. D. exoskeleton. E. hydrostatic skeleton.
Which hormone stimulates smooth muscle contractions during parturition?
a. oxytocin b. FSH c. HCG d. LH e. progesterone
A(n) ________ is all of the species in an ecosystem that can interact in a geographic area
Fill in the blank(s) with correct word