Make a list of the common types of physical evidence. Include the type of evidence, how the evidence should be handled, and how it is examined at the crime lab. Identify each type of evidence as biological materials, impressions, or manufactured items.

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