A science class is checking to see how much life exists in local streams. The
students each go to a stream and take a sample of water. What step of the
scientific process is this?
A. Peer reviewing
B. Forming a hypothesis
C. Drawing conclusions
D. Collecting data

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