All spheres of earth are interrelated or interdependent. this means a. they are separate spheres and function independently b .they are related in that they are of earth and function for earth c. they all depend on each other to function; an impact to one sphere usually affects another d. one cannot exist without the other

Which flexible structure that supports the nerve cord and led to the backbone

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.