There is an underground aquifer you want to make sure hold for an extended period of time. the layer the aquifer is located in has to have a lot of water and allows the water to discharge slowly into the other layers. that means it has a porosity and a permeability

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Asmall population of chimpanzees lives in a habitat thant undergoes no change for a long period of time. how will genetic drift affect this population

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.