Who developed and reorganized the system of classifying stellar types for stars? Einstein
Cannon
Sears
Kepler

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

Four types of motile cells in human body?

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.