The inability for a male to obtain or sustain an erection is called ________.
Fill in the blank(s) with the appropriate word(s).
impotence (or erectile dysfunction)
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Describe the events that must occur in order for sperm to penetrate an egg. What prevents more than one sperm from entering? In the case of twins, how many sperm entered the egg? Why must a man have millions of sperm in a semen sample to be considered fertile? If only one sperm were present in the semen and that sperm managed to find its way to the egg, could it fertilize the egg? Explain.
What will be an ideal response?
What structure contains the receptor cells for hearing?
What will be an ideal response?
An abnormal, exaggerated response of the immune system is called ________.
A. an innate immune response B. tolerance C. hypersensitivity D. excess immunity E. immunization
The smallest stable units of matter are
A) atoms. B) molecules. C) protons. D) neutrons. E) electrons.