Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure _____ different circuits for blood flow. 

A. two
B. three
C. four
D. eight


A. two

Biology & Microbiology

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The ultimate source of energy trapped during photosynthesis is

(a) CO2. (b) H2O. (c) O2. (d) sunlight.

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B and T lymphocytes are specific; they have only a single type of cell marker on their surface.

Answer the following statement true (T) or false (F)

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Which term refers to a horizontal stem modified to penetrate the substrate and anchor a plant?

a. sporangium b. protonema c. shoot system d. rhizome

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Which of the following apicomplexan genera cause coccidiosis in chickens?

A. Plasmodium B. Eimeria C. Toxoplasma D. Pneumocystis

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