A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression.
You will also like...
The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..
Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..
This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..
Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..