Is the gradual change in the types of species that live in a community. this can include primary and secondary situations

An easy way to calculate the amount of energy available at each level is to what?

What is the cause hearing loss in human being

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere