My Day!!!!!

Today after school I need to finish a power point presentation for my enviornmental science class. I need to do it about a pest in my world. In the presentation I need to explain what the pest's purpose is in the world. I'm doing mine on rats and I found out that they do actually have a purpose. In the wild rats eat grains and other seeds and some of their food sticks to their fur and it transfers to a new location.