I Am Alive!
You are not alive but we need each other.
The first one is respond. Living things can respond in many different ways. I often times respond to light. Even though I don't have eyes I can sense light. I don't like light so I live in you.
Reproduce means to make more of something. I can make more worms because I am living. You can not reproduce. This a characteristic I have that you don't.
Chemical activities are activities that living things do in there body. It may not seem like it but I do chemical activities just like humans. I perform digestion and respiration. You don't do any chemical activities.