Porous underground layers of rock that can store large amounts of water known as . A. groundwater
B. Aquifers
C. sounds
D. none of the above

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

Some substances but not other can cross the (blank) membrane of a cell

Why are recessive alleles not removed from populations over time? a. individuals can pass recessive alleles on to offspring b. recessive alleles are removed with enough time c. recessive alleles will always reappear after being removed