According to the rivet model of community structure, a) species share a community because of similar abiotic requirements. b) communities generally lack sharp geographic boundaries. c) if a species disappears from the community, its role will be assumed by another species. d) all species in a natural community contribute to the community's integrity. e) dependence on a particular type of soil rivets plant species into a tightly networked community.

D) all species in a natural community contribute to the community's integrity.

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scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production