Biology

Tara Lynch

20 December, 09:58

Aziza is designing an experiment to test whether the color of a hummingbird feeder affects the number of hummingbirds that feed at it.

She plans to buy four hummingbird feeders and four different colors of paint. She will paint each feeder a different color, fill each feeder

with hummingbird food, and then hang the feeders outside so that she can count how many hummingbirds visit each feeder.

Which of the following factors should Aziza keep constant throughout her experiment in order for her experiment to be reliable and fair?

the shape of the

hummingbird feeders

the color of the

hummingbird feeders

the size of the

hummingbird feeders

the height at which the

hummingbird feeders are hung

the number of hummingbirds

that visit each feeder

the kind of hummingbird food

placed in each feeder