Tamara and Tyler are both interested in studying birds. Tamara goes to the park and uses her notebook to record the number and colors of birds that she sees there. Tyler designs a plan to test what kind of birdseed the birds at the park eat the fastest.

What kind(s) of scientific investigation are Tamara and Tyler doing?

A.

Tamara and Tyler are both using observation to study birds.

B.

Tamara is using observation, whereas Tyler is doing an experiment.

C.

Tamara and Tyler are both doing experiments on birds.

D.

Tamara is doing an experiment, whereas Tyler is using observation.