Deoxygenated blood is initially collected by the:
a. dorsal aorta.
b. sinus venosus.
c. atrium.
d. bulbus arteriosus.
e. vena cava.
B
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Hereditarianism is the idea that all human traits are ____
a. partly influenced by environment b. traceable to our earliest ancestors c. influenced equally by genes and environment d. determined only by genes e. immutable from generation to generation
Which mechanoreceptor(s) responds to vibrations?
a. free nerve endings only b. Pacinian corpuscle only c. Ruffini endings only d. free nerve endings and Meissner's corpuscle e. Pacinian corpuscle and Ruffini endings
In which of the following habitat types would species diversity be expected to be relatively low?
a. high environmental stress b. low environmental stress c. continental ecosystems d. ecotones e. mature successional communities
Why do scientists apply the concept of maximum parsimony?
a. to decipher accurate phylogenies b. to eliminate analogous traits c. to identify mutations in DNA codes d. to locate homoplasies