Acommon form of abuse of amphetamines that is damaging to the body is
a. using amphetamines to counteract the effects of depressants taken the night before.
b. snorting.
c. mixing amphetamines with nicotine.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food