Answer:
All organ system(s) are important for proper functioning of the organism but I think Circulatory System is the most important one...!
Explanation:
Because the organism will die without proper blood circulation...!
Answer:
D) Can simple organic molecules form spontaneously in an oxygen-free atmosphere?
Explanation:
"Can dogs identify colors?" is a question that can be answered scientifically. but "Are dog better than cats?" cannot be answered scientifically because it will be answered with personal opinion.
