Fact 1: Zinc has a positive impact on the healing of wounds.

Fact 2: If an animal is wounded then the wound is healed.

Given the two facts above, answer the question "what does zinc have a positive impact on?" with the following options: 
- humans
 - gravity
 - the skin
 - density
 - cells
 - plants
 - clouds
 - animals


 

        animals 