The most likely explanation for any mass-extinction event is

A) a gradual increase in global temperature.
B) coevolution of predator and prey species.
C) loss of genetic diversity due to inbreeding.
D) human activity.
E) rapid environmental change.


E

Biology & Microbiology

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The structure indicated by the letter "C" above

represents a. actin. b. myofibril. c. myosin. d. myofilament. e. muscle fiber

Biology & Microbiology

Incomplete

What will be an ideal response?

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The atrioventricular valves are closed when the

A) right atrium is contracting. B) P wave of an electrocardiogram appears. C) heart is completely relaxed. D) ventricles contract. E) ventricles are relaxed.

Biology & Microbiology

Which of the following secretes erythropoietin?

A. heart B. thalamus C. thymus D. kidney E. small intestine

Biology & Microbiology