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.

Biology & Microbiology

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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.

Biology & Microbiology

Unlike pinnipeds, sirenians are completely free from the terrestrial environment

Indicate whether the statement is true or false

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology