When onion cells are placed in a hypertonic solution, the red pigmented area of the cell..
a) increases
b) decreases
c) increases then decreases
d) does not change

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary