PBS
Pbs Learning Media: What's Up With the Weather: Graphs
Examine this graph from FRONTLINE/NOVA: "What's Up with the Weather?" Web site to see dramatic increases in three greenhouse gases over the last two hundred years.
Other
The Paleontology Portal: Fossil Gallery
An image gallery of fossils through time. Students choose a time period to see what life was like by studying the fossils.
Estrella Mountain Community College
Online Biology Book: The Nature of Science and Biology
Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.
McGraw Hill
Glencoe Biology: Fossil Evidence of Change: Self Check Quiz
Try these five multiple-choice questions about fossil evidence of change. After submitting answers, students can review the material.