Answer:
Probably this site tells you the broad idea of this subject. https://faculty.weber.edu/btrask/genetics_practice_problems-answer_key.pdf
Explanation:
I don't know anything really, I just saw the please help me title while reading an answer and this is a long shot away from my major. My best guess is A.
Blood, flowers, bacteria, and skin
1 reason is to kill disease in water
Acids break down the sandwich and it goes into the intestines and the enzymes and bacteria break it down more then it is absorbed into the intestines through the body.
Answer: A. Autotrophs supply food for the heterotrophs.
Explanation: A deer is a heterotroph and a plant is a autotroph. Examples of heterotrophs are animals and humans, and examples of autotrophs would be plants and algae. Therefore, because a deer consumes plants that means that autotrophs supply food for the heterotrophs. And by the way I did the exam myself and got this answer correct!