Answer:
H. Immue and digestive
Explanation:
The immune system fights pathogens protects us from them, the digestive system destroys pathogens that may be in our stomach or intestines.
Answer:
I believe it's an organ
Explanation:
Organs have atleast two or more tissue types and preform specific sets of functions for the body.
Carbon dioxide and water (and sunlight)
Answer: The answer would be Hypothesis, Experiment, Analysis of data, then lastly conclusion.