The correct answer is A.
Hunger, chemical imbalance, and blood levels are all internal issues. Cat dander on the other hand is not something the body creates or and is something in the environment.
Thus, your answer is A.
Answer:
the kinetic energy of the reactant molecules(C)
Explanation: i hope this is the correct answer if this is wrong or incorrect please let me know
Carbon is the one and only element to make a molecule organic.
