One function of the human excretory system is *
a
Making materials that the body cells need
b
removing excess heat energy from the body
c
moving substance to and from the body cells
d
controlling the body's responses to stimuli

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?