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 correct answer is cell wall
<span>Nucleic acids as the </span>nitrogen<span> is part of the </span>nitrogen<span> base and the phosphorous is part of the </span>phosphate<span> group.</span>
Epithelial tissue as she scrapes the top few layers of skin
If organisms can not adapt they become extinct.