The number of a given species in a given area at a particular time

Isotopes of the same element have differ in their

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

Earths energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your homes electricity, and explain why you chose that source. can someone give me some ideas, i’m kinda confused.