What is a major economic contribution of the Appalachian Plateau?
A. pulp and paper
B. fishing
C. coal
D. agriculture

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

How is the carbon cycle related to global warming ?