Regulator or conformer?

You will write a function for the slope of body temperature against air temperature, and use it to name the response of an animal.

The idea. A regulator has a slope near $0$, and a conformer has a slope near $1$.

Your tasks.

1. Finish slope. It gives the slope of the best straight line through the points.
2. Finish response. It gives "regulator" for a slope below $0.2$, "conformer" for a slope above $0.8$, and "partial" otherwise.
3. Set steadiest to the name of the animal whose body temperature has the smallest range.