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spinal cord
Steroids
an organism that can reproduce itself in a host
red meat
Rabies, chickenpox, and influenza are viral. Heart disease may or may not be caused by a virus.
true a+
HPV is the most common sexually transmitted virus in the United States.
sensory receptors
Not generally; you normally won't be able to tell visually that a person may have an STD.
In some cases, you might be able to recognize blisters similar to cold sores, which can be indicative of the Herpes virus, but not all herpes causes these blisters, and not all blisters are symptoms of herpes. Severe STDs may cause a visible rash or an odorous discharge, but again, these are not reliable indicators either way.
Definition: The average number of people living in a square mile or square kilometer.
Population density refers to the number of people per unit area.
