a scientist hypothesizes that the food in an ecosystem may have been contaminated with radioactive nitrogen over a period of six months. which of the following substances could be examined for radioactivity to test the scientist's hypothesis?

How many questions do they give on the sat

Whats begin with t, ends with t has t in it

How are 3-d printers useful in studying evolution? a. to color the fossils of organisms b. to create clones of extinct organisms c. to create replicas of fossils d. to prepare paper cutouts of organisms e. to study the composition of fossils