Question

Sam is observing the number of hummingbirds that are attracted to his bird feeder. He counts the number of birds at his feeder at 6 a.m., noon, and 6 p.m. over 10 days. What are the variables in Sam’s investigation?

A.The number of birds is the independent variable, and time is the dependent variable.

B.Time is the independent variable, and the number of birds is the dependent variable.

C.The type of bird food is the independent variable, and the number of birds is the dependent variable.

D.The number of birds is the independent variable, and the type of bird food is the dependent