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?

The students who were in favor of adopting the new curriculum wrote editorials for the local newspaper which of these best describes how the information in the editorials is different from the information in the feature story

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

In the_ work-study program, college students who have financial needs can work part-time jobs to pay for education expenses. a stafford b university c federal d pell