Researchers have found that nicotine, one of the main substances in cigarettes, indirectly releases dopamine, which produces a "feel good" sensation in people who smoke. based on this finding, nicotine would be an example of a/n

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources