Which are characteristics of all protists? check all that apply.
they are heterotrophs.
they have nuclei.
they live in moist environments.
they reproduce sexually.
they are unicellular.

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