In order for evolution to occur, there must be A. Oa change in the temperature of the environment
B. change in migration patterns within a population
C. variation inthe gene pool of a population
D. a catastrophic event that occurs in the ecosystem

What is a coast of using technology to transport water? a.cities can be built in otherwise uninhabitable areas. b.crops can be irrigated and grown in new areas. c.floods can be averted in flood-prone areas. d.freshwater supplies can be depleted in an area.

What causes the phospholipids to organize themselves the way they do

Which image shows labeled organelles that are present only in plant cells?