What is true about a circular orbit?
it is a special kind of elliptical orbit.
it is the same as an elliptical orbit.
it has no kinetic energy.
it has no potential energy.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food