Answer:
B) Help produce oxygen
C) Help make foods
D) Help break down dead materials
Explanation:
B - Life on Earth <em>depends</em> on protists since they are the ones who supply us with oxygen.
C - Provide food to other living organisms in food chains/webs.
D - Even, recycle important nutrients just for other life forms to use (some protists may also be decomposers; as they also release nutrients into the environment).
The answer is:
A) light microscope
Answer:
Clouds lack any characteristics of life. Clouds can not breathe, eat, produce their own food, grow, or reproduce. Hope this helps :)