Acalorie is the commonly used unit of chemical energy. it is also the unit ofa. radioactivityb. lightc. heatd. sound

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic.

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