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.
Biology & Microbiology
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)
Biology & Microbiology
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
Biology & Microbiology
Which of the following apicomplexan genera cause coccidiosis in chickens?
A. Plasmodium B. Eimeria C. Toxoplasma D. Pneumocystis
Biology & Microbiology