Until the 1600s, people who investigated problems related to our understanding of the natural world were called

Modern whales developed their traits through natural selection what occurs during the process of natural selection

20 the compound al(nh3)2 has atoms of nitrogen.

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