why do atoms of the same element always have the same number of protons but sometimes have different mass number? What do you call these atoms?

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.

Which describes a grizzly bear’s habitat?

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f