Humans, fruit flies, and reptiles have their own rules where sex chromosomes are concerned. Scholars flip through a slide show offering an explanation of the chromosomes that determine the sex of different species. What is female in one...

Scientists use morphological, physiological, and molecular information to continually revise organism classification. Scholars observe and learn about 20 shells. Then, they work to sort and classify the shells, building a taxonomy based...

In this online interactive English vocabulary skills worksheet, students answer 10 matching questions which require them to fill in the blanks in 10 sentences. Students may submit their answers to be scored.

In this forest animals activity, students complete a four question multiple choice on-line interactive quiz. Included are questions about: wild boar, roe deer, red fox and red deer.

This game is based on the PBS Kids' series, Plum Landing. Students will read various informational texts about invasive species. Then students will attempt to rid various regions of their invasive species.

Follow the endangered Porcupine Caribou Herd with Karsten and Leanne as they "become caribou" for a season. Students can watch a movie, read their diary and view slides of the herd.

Explore how environmental conditions affect the adaptation of birds in this simulation. The amount of annual precipitation on an island is controlled by you while you track changes in the thickness of bird beaks over a five-year period....

About 328 species of hummingbirds flit and flutter in the Western Hemisphere. Just 14 species regularly nest and raise young in the United States. The six species included on this site all include the United States in their breeding...

In this ecosystem consisting of hawks, snakes, rabbits and grass, the population of each species can be studied as part of a food chain. Disease can be introduced for any species, and the number of animals can be increased or decreased...