Length: 28:03 | HS C A | Views: 171
This program clearly and concisely maps out the complicated human immune system, explaining both how it keeps the body healthy and what happens to the body if it malfunctions--or, even worse, if it shuts down completely. Also described are a number of ... problems with the human immune system, running the gamut from allergies to AIDS. Viruses and antibiotics are also discussed, as is the growing danger of bacterial resistance to current medicines. The effects of major histocompatibility complexes on transplanted organs are considered as well.
Length: 20:11 | HS C | Views: 217
This program introduces students to a variety of the world's aquatic biomes. The characteristics of saltwater and freshwater environments are clearly described, as are the plants and animals that call these watery regions home. The importance of evolution ... and adaptation for aquatic species is emphasized.
Length: 17:17 | MS HS C A | Views: 514
By comparing and contrasting arid and semi-arid regions, this program provides students with a balanced picture of what the Earth's desert biomes are like. The program also investigates how the few plants and animals that inhabit these ecosystems survive ... the extreme temperatures and severe lack of water that characterize the desert environment.
Length: 17:03 | MS HS C A | Views: 259
This program can help students learn to identify the climates, life-forms, and behavioral adaptations that go with each type of grassland biome. Factors that threaten the survival of these habitats' distinctive animal communities--and of the ecosystems ... themselves--are also addressed.
Length: 20:05 | MS HS C A | Views: 414
Through this program, students can expand their understanding of rainforests and how their inhabitants live. Special attention is given to the threats to these incredibly rich ecosystems, home to more than half of the different kinds of animals and ... plants that live on Earth.