Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a
A. neurogenic heart while vertebrates have a myogenic heart.
B. myogenic heart while vertebrates have a neurogenic heart.
C. neurogenic heart while vertebrates have a cardiogenic heart.
D. cardiogenic heart while vertebrates have a myogenic heart.
E. autonomous heart while vertebrates have a neurally controlled heart.
A. neurogenic heart while vertebrates have a myogenic heart.
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Homo erectus has been shown to have dispersed from
A. Africa. B. Asia. C. South America. D. Europe. E. North America.
Unlike pinnipeds, sirenians are completely free from the terrestrial environment
Indicate whether the statement is true or false
The input zone of a neuron involves the:
a. axon only b. axonal terminals only c. cell body only d. dendrites only e. cell body and its dendrites, but not the axon or its terminals
Hutton's theory of geological change included all EXCEPT
A. sudden extinction of species due to sudden, widespread disasters. B. extreme geological change occurring over a long period of time. C. production of layers of sediment through slow deposition. D. slow cycles of erosion and uplift.