Why would we store excess food as fat? What purpose does it serve?

If you eat excess calories, your body stores the energy as glycogen or fat to use at a later time. Like if you go on a long run or swim you will wait to eat fats before so you'll have energy later.

explanation:

1 rosales   order

2 eurarya   domain

3 rosaceae   family

4 cania - genus

5 plantae - kingdom

6 magnoliopsida - class

7 rosa - species

8 magnoliophyta - phylum