By-
Britt Nelson
This page has performed all the requirements of The National Science Education Standards for grades K-4 for Life Science. It teaches that changes in enviroments can be natural or influenced by humans. Some changes are good, some are bad, and some are neither good or bad. Pollution is a change in the enviroment that can influence the health, survival, or activities of organisms including humans.
Pictures on this web page courtesy of Grolier Publishing.