Answer:
B) Help produce oxygen
C) Help make foods
D) Help break down dead materials
Step-by-step explanation:
B - Life on Earth depends 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).