Widely scattered cells embedded in large amounts of extracellular material composed of randomly arranged collagen fibers make up
A) adipose tissue.
B) cardiac muscle.
C) stratified epithelial tissue.
D) dense connective tissue.
E) loose connective tissue.
E
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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.
Compare and contrast the homology that occurs in the forelimbs of mammals. What will be an ideal response?
Cholera is an example of a pandemic disease that
A) has multiple wild animal reservoirs and is thus difficult to eradicate. B) spreads from a common source and could be controlled with adequate clean water and waste sanitation measures. C) is spread through direct contact and has only a human reservoir. D) has recently emerged due to overcrowding in urban centers.
The respiratory systems of fish and birds are similar in that both______________.
A. utilize air sacs. B. have similar partial pressures of oxygen in the environmental medium. C. have unidirectional flow of the environmental medium over the gas exchange surfaces. D. employ countercurrent exchange.