Please help me with this one ( it's due tomorrow! ) Exam the following observations and try to come up with good hypotheses

Obs. 1 : Rats that live near human dwellings are fatter than rats that live completely in the wild.
Obs. 2 : Fishing lures often look like nothing in nature, yet fish will attempt to eat them.
Obs. 3 : Dragonflies can be seen flying low above our basketball courts, and will sometimes touch the end of their abdomen to the concrete.