To facilitate respiration, birds have extensions of their lungs called ____, which reach into all parts of their bodies
a. tracheal tubes
b. spiracles
c. air bladders
d. parabronchi
e. air sacs
e
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External fertilization
A. occurs in amphibians. B. often leaves fertilized eggs susceptible to predation. C. involves the release of eggs and sperm into a body of water. D. requires specialized behavior. E. All of these statements are correct.
Chemical bonds that are formed when one atom with a partial positive charge (created from unequal
sharing of electrons) is electrically attracted to another atom with a partial negative charge (also created from unequal sharing of electrons) are called ____.
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Which hormone, made by the kidney, is necessary for red blood cell production by bone marrow?
a. erythropoietin b. hemoglobin c. insulin d. erythrocytes e. leucocytes
Recently, microorganisms have been used to clean up oil spills in the oceans of the world. This is an example of
A) agricultural microbiology. B) food microbiology. C) bioremediation. D) epidemiology.