What do scientists know about extrasolar planets? there are very few that are habitable. there are several that have liquid water on them. they don’t exist. there are likely billions of them in the galaxy.

1.if the dartboard below is used to model an atom which subatomic particles would be located at z?

As a small change in a person's dna can cause a genetic disorder

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