Immune System. Its like the Army for your body!
Depends in the weight of tge objects, but they will be drawb together
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
The organism would be a secondary consumer and a carnivore. An example could be an snake in the following food chain: grass -> bunny -> snake