Where is the standardizing variables The number of flowers on different breeds of bushes in a greenhouse is recorded every week for two months.

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils