Answer:
Forests.
Explanation:
They decrease the amount of Carbon dioxide & increase the amount of Oxygen.
<span>The wall of the alimentary canal is composed of four basic tissue layers: mucosa, submucosa, muscularis, and serosa.</span>
It reduces the crop’s ability to develop disease resistance
A deposit of sand or mud built up along, and sloping away from, either side of the flood plain of a river or stream. Expand Also called levee,<span> Examples from the Web for </span>natural levee<span>.</span>