Red blood cells originate from the bone marrow.

a. true
b. false


Answer: a. true

Biology & Microbiology

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In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development

The stage where the developing frog arrests depends on the species involved in the cross. This is an example of A. hybrid breakdown. B. hybrid sterility. C. hybrid inviability D. sexual isolation.

Biology & Microbiology

Asian pearl divers hyperventilate in order to reduce the ____ concentration in the blood

a. oxygen b. hydrogen ion c. carbon dioxide d. chloride ion e. hemoglobin

Biology & Microbiology

How does the nervous system change with aging?

What will be an ideal response?

Biology & Microbiology

The binding of an antigen to an antibody can result in Select one:

a. neutralization of the antigen. b. agglutination or precipitation. c. complement activation and opsonization. d. all of these. e. neutralization of the antigen and agglutination or precipitation only.

Biology & Microbiology