Answer:
A. the digestive, muscular, and respiratory
Explanation:
Muscle weakness affects the muscular system (muscles are in the muscular system) , stomach pain affects the digestive system (stomach is a part of the digestive system), and coughing affects the respiratory system (coughing hinders the ability to breathe properly).
The pig heart is big,and the chicken heart is small.
Answer:
All of the above is the answer because they are all an important factor in the formation of a fossil.
Answer: the potato chip becomes a substance that is soft and very floppy
