What is a scientific theory?
A.
A statement that cannot be tested scientifically
B.
A statement of fact that describes an action or set of events
C.
A guess or prediction based on previous experience or observation
D.
A unifying model or explanation based on a large body of experimental data

B.  A statement of fact that describes an action or set of events

Explanation:

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

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