In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gene
A. mutation.
B. duplication.
C. deletion.
D. regulation.
D. regulation.
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Adaptations to terrestrial environments evolved independently in arthropods, mollusks, nematodes, and annelids. What logical conclusion would you make from this statement?
A) All these groups have a coelom. B) The common ancestor of all these groups was probably aquatic. C) All these groups have the same type of body plan. D) All these groups lost their coelom after moving to land.
What birds only come to land to breed?
a. Albatrosses b. Alcids c. Petrels d. Terns
The main phenomenon that increases the efficiency of gas exchange in fish gills is the
A. back-and-forth movement of water that maximizes oxygen uptake. B. high degree of oxygen saturation of water. C. very high blood pressure found in the circulatory system of fishes. D. co-current exchange mechanism. E. countercurrent exchange mechanism.
__________ occurs in different patterns depending
on the species and selection pressures. Fill in the blank(s) with the appropriate word(s).