5. in the past, agriculture work was completed by
a fossil fuels and machines
b machines and humans
c animals and machines
d humans and animals

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

The pelican's beak is adapted for in .

The wind is to parities grasses because it them