A somewhat amusing assignment, this worksheet lists statements that an ancient organism may have made and asks learners to determine what geologic era that each may have lived in. It uses witty word puzzles and fill-in-the-blank-style...

This quiz just looks neat! It has two cell diagrams for biology class members to label. They also describe the function of each organelle. A prokaryotic and eukaryotic cell are displayed for them to compare, and then they fill in the...

The first of three pages in this handout provides a brief history of our understanding of the cell. It also differentiates between prokaryotic and eukaryotic cells. The second is a collection of true and false, multiple choice, and short...

In this history of life worksheet, students complete a crossword puzzle by figuring out the vocabulary words associated with the 11 clues given. Then students review how paleontologists use fossils to learn more about past living things...

Five pages take biologists on a generalized survey of the origin of life. Queries are made regarding theories of how life developed, ancient Earth conditions, and the ever-changing field of taxonomy. The experiments of different...

In this history of life worksheet, students review 4 vocabulary words associated with the beginnings of life. Students place these terms into a crossword puzzle and then complete 2 fill in the blank questions.

In this evolution activity, students will complete a table by writing in the era and biological event based on 4 different time periods of Earth's history. Students will answer 8 fill in the blank questions based on the different origin...

In this electronic worksheet, students complete 4 short answer, 6 fill in the blank, and 4 term identifications about electronics.

This site provides a guideline for writing a comparative essay for the AP World History Test. It also provides practice exercises and samples.

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...

Video describes the development of the cell theory and some of the scientists and disagreements involved. [6:12] Includes a short quiz and a list of additional resources to explore.

Essay on the history of our knowledge of cells and the development of the cell theory.

Through full-color images and concise information, learn about the origin of cells. Discover some of the notable studies surrounding the history of life on Earth.

Take this self-checking, five question quiz over the discovery of cells and cell theory.

Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.

Eukaryotic cells have separate DNA from mitochondria and chloroplasts which indicates that they were once primitive cells on their own. This multimedia article includes animations, pictures, video, biographical information, and quiz...