An eight-unit electronic textbook provides a guide to AP® Biology. Each of the 28 chapters include an introduction, multiple lessons, a summary, review questions, and test prep questions. Teachers see how each lesson connects to a big...

How diverse are living things? Individuals explore topics such as cells as the foundation for life, cell division and genetics, molecular biology, and animal reproduction using an open resource Biology textbook. They learn key terms...

Curriculum resources can be expensive—but not this one. An online textbook offers informational text for a complete high school Biology course. Topics include energy flow, body system, genetics, and evolution.

Physical and biological factors affect everyday living. Scholars explore electromagnetic forces, motion, the rock cycle, and geological changes. They examine cells as the building blocks of life and how organisms reproduce using images...

[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook which serves as a comprehensive overview of Biology concepts.

These pages are part of a site called "Evolution," that accompanies a textbook by the same name. Mark Ridley is the author, and in this section he discusses the evidence for evolution.

Explore the evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation.

RCN offers information about plants, including the evolution and classification of different groups.

This digital textbook covers core biology concepts and includes interactive features, real-world examples, videos, and study guides.

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

Learn about virus evolution and genetic variation in viruses.

Examine Charles Darwin's voyage on the HMS Beagle and his ideas about evolution and natural selection.

When a population is in Hardy-Weinberg equilibrium, it is not evolving. Learn how violations of Hardy-Weinberg assumptions lead to evolution.

Through full-color images and descriptive information, learn about the evolution of the eukaryotic organisms which eventually led to the presence of protists.

[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Biological science concepts for middle grades.

An in-depth reference explaining the role of seed plants in biological diversity. Photographs and labeled diagrams help learners with understanding.

Since evolution favors genetic variability what prevents pollen from fertilizing its own eggs? This effective site presents answers to this question.

Find out how evolution happens due to chance events. Explore the bottleneck effect and founder effect.

Explore some different areas of study in the life sciences.

This digital textbook covers core life science concepts and includes interactive features, real-world examples, and videos.

Read the full text of "Origin of Species", considered to be the foundation of evolutionary biology, by Charles Darwin on this site.

How natural selection works at the level of genes, alleles, genotypes, & phenotypes.

Find out what defines a species, and learn how new species can arise from existing species.

Learn what a phylogenetic tree is, Learn how to read phylogenetic trees and determine which species are most related.