Part of the NASA website, this is a reprint of an article in the Journal of the Royal Astronomical Society of Canada about Edwin Hubble's life and accomplishments, stressing his role in the development of modern astronomy.

This personal page provides a table of contents to everything one would want to know about marine flatworms. Includes photos, charts, references, and much more.

Article explaining what viruses are, their evolution, taxonomy, morphology, and replication. Also covers mechanisms by which viruses cause disease, how they can impact on plants, and the potential and real benefits we get from...

Extensive article on mangroves. Covers classification, physical characteristics, life cycle, habitat, economic value, and natural and human threats to their survival.

Explains what differentiates ferns from other plants, their physical characteristics, taxonomy, life cycle, how they evolved, and where they occur.

[Free Registration/Login may be required to access all resource tools.] Traditionally, mammals were divided into groups based on their characteristics. Scientists took into consideration their anatomy, their habitats, and their feeding...

We all know that the ocean is home to many beautiful and mysterious creatures. Mysterious cannot begin to describe the fish living in the depths of the ocean. Imagine the kind of creature that lives thousands of feet underwater! Sunlight...

These pictures of the Sea otter are comically adorable. Use this site to read a detailed fact sheet on the sea otter and to check out the photos.

This site is a description of the history behind the 5 Kingdom system suggested by Robert Whittaker. An extensive list of resources is included.

Kevin and his grandfather, Omag are going to the zoo. Join them and learn all about animal classification and life cycles.

[Free Registration/Login may be required to access all resource tools.] Scientists used to think that fungi were members of the plant kingdom. They thought this because fungi had several similarities to plants. However, there are a...

Explore the world of plants and all that encompasses the second biggest kingdom of classification.

An informative site from Sea and Sky that contains basic characteristics along with a number of beautiful pictures of the common marine reptiles.

Explore the fascinating world of the common jellyfish by learning about its distribution, behaviors, habitats, and classification through videos, photos, descriptions, and external links.

In online and offline activities, students broaden their understanding of animals by learning to identify and classify animals into six categories: mammals, birds, fish, amphibians, reptiles, and invertebrates.

This online exhibit from the Natural History Museum branches out in many fields to cover the broad topics of reptiles, amphibians and fishes. Thirteen subtopics are provided including several videos and informative articles.

The title could be slightly misleading for this site. It is actually a teaching and learning module on the science of cladistics. As they go through the module, students will increase their understanding of, and appreciation for, the...

A lesson on the classification of mosses and liverworts as well as the physical make up and similarities of the species.

The content of this site features photographs of the Pileated Woodpecker and audio content of his call. Students will have an opportunity to learn about this land bird's characteristics, range, habitat, diet, life cycle, and behavior...

The red-headed woodpecker can be found in woodlands throughout the United States east of the Rocky Mountains. The content of this site includes information on the characteristics, habitat, life cycle, range, behavior and diet of this...

This site examines the Ruffed Grouse a type of Running Bird. Learn more about this bird's characteristics, life cycle, behavior, diet, habitat, and range when you explore this source.

This site offers a clear and concise look at the Semipalmated Plover. The information covered in the source includes characteristics, habitat, life cycle, range, diet and behavior. You will also find clear photographs of this aquatic bird.

Come and check out this informative resource on the Swainson's Hawk. The content of this source includes a look at this species' characteristics, range, habitat, diet, behavior and life cycle.

What characteristics make a Whimbrel unique? Find out more about this fascinating type of sandpiper when you visit this educational resource. This site features information ranging from diet and life cycle to behavior and habitat.