Oxygen-poor blood from the body first enters the heart in the ______.
a) right ventricle
b) left ventricle
c) right atrium
d) left atrium
e) coronary vein
Ans: c) right atrium
Biology & Microbiology
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The body contains approximately ____ muscles
a. 206 b. 350 c. 475 d. 525 e. 600
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Echinoderms
A. are only found in the ocean. B. have a water vascular system. C. have radial symmetry. D. All of the above are correct.
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Separation of the sister chromatids is a characteristic of which stage of mitosis?
a) anaphase b) telophase c) metaphase d) prometaphase
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