The profusion of skin colors and physical characteristics of different humans is due to .

a. the development of pure races

b. the differences in climate and other living conditions humans encountered as they populated the globe

c. biology rather than evolution

d. the emergence of dominant groups in the last three centuries

An ecologist is studying the effects that a population of predators is having on a population of a prey. he used data from the field to produce this graph. which conclusion can draw from the graph?

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service