Everything evolved from a common ancestor, but how did modern plants and animals develop so many more genes? Scholars use an online interactive to learn about the process. They begin to understand common genes with an animation, multiple...

Earth didn't always have oxygen, so what caused the change that allows humans to live here? Learn about the change in O2 levels throughout geological history through an interactive graph. Each section offers greater detail on the changes...

In this online interactive history worksheet, students respond to 9 short answer and essay questions about Charles Darwin. Students may check some of their answers on the interactive worksheet. 

In this reading comprehension worksheet, students read an extract from Darwin's book The Voyage of the Beagle.  Students answer 12 comprehension questions in 15 minutes in this SAT practice worksheet.

In this English idioms worksheet, students interpret the meaning of various idioms based on clothes and clothing.  Students complete sentences using the meanings of the idioms.

This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page. Here you can see how common genes are evidence for common...

Explore the evidence for human evolution in this interactive timeline - climate change, species, and milestones in becoming human. During the period of human evolution, the Earth's climate has fluctuated between warm and cold. Some of...