Students examine the relationships between plants, animals, and the environment in ecosystems. They sort animal cards, collect natural materials from the schoolyard, and record an ecosystem web in the form of a poster.

Students read the story "The Perfect Pet". They examine how scarcity is a problem in society when people can not have everything they want which forces them to make (economic) choices.

Several techniques let you animate parts of your webpage. There are many questions to consider when you're considering what technique to use. This article discusses the pros and cons of different techniques to help you choose the best...