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Carbon Dioxide
12 percent
skin
Kat <3
True. Brain wave activity changes from the waking state through the various stages of sleep, but the brain is active all of the time. When the brain is no longer active at all, death is at hand.
Steroids
Neurons send and return messages to each other.
METHAMPHETAMINE
51 percent
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.
Neurotransmitter
