Showing results for "System" in Animals & Nature

Most of Earth is covered in water. Water falls from the sky as rain or snow. All living things need water to survive. Discover why water is an important part of nature!

Erosion changes Earth's natural features. It breaks down materials and can help make something new. Discover why erosion is an important part of nature!

Different kinds of rocks are found on Earth. Many are found deep inside Earth. Discover why rocks are an important part of nature!

All living things need air to survive. Air also protects Earth. Discover why air is an important part of nature!

Plants and animals from millions of years ago left behind fossils. Fossils can teach people about the past. They are also used for fuel. Discover why fossils are an important part of nature!

Soil covers most of the land on Earth. It feeds plants and is home to many animals. Discover why soil is an important part of nature!

Deciduous forest ecosystems can be found on nearly every continent. Countless animals and plants live in them. So what difference could the loss of one animal species make? Follow the chain reaction, and discover how important gray wolves are.

Grassland ecosystems can be found on nearly every continent. Countless animals and plants live in them. So what difference could the loss of one animal species make? Follow the chain reaction, and discover how important honey bees are.

The ocean ecosystem is huge, covering most of our planet. Countless animals and plants live there. So what difference could the loss of one animal species make? Follow the chain reaction, and discover how important sea otters are.

The tundra ecosystem is vast, covering a large part of the far north. Countless animals and plants live there. So what difference could the loss of one animal species make? Follow the chain reaction, and discover how important lemmings are.

Corals are tiny sea creatures that make a big impact. By working together, corals build huge reefs where many plants and animals live. Get ready to uncover the secrets of these ocean ecosystem engineers.

Alligators are engineers of the wetlands. Learn all about these amazing animals, including where they live, details about their life cycle, how they change their environment, and how the changes they make benefit other wildlife.

In this exhilarating installment of the award-winning Scientists in the Field series, journey to the isolated islands of Isle Royale National Park where the longest predator/prey study in the world is being conducted along with a controversial genetic rescue to save not only the wolves and moose...

Do you know how sea otters help kelp forests? Discover where sea otters live, how their actions make them ecosystem engineers, and more!

Honey bees play an important role in the environment. But what makes them ecosystem engineers? From how they pollinate plants to how their actions benefit other animals, learn all about these tiny but mighty insects.

Elephants are powerful engineers that make many positive changes to their ecosystems. From trampling trees to digging watering holes and more, explore the lives and habits of these gentle giants.

With strong dams and lodges, beavers create a home for many freshwater plants and animals. Dive into the lives of busy beavers and discover how they engineer their ecosystem to fit their needs.

In Elkhorn Slough, an inlet on the California coast, seagrass grows healthy and strong in the shallow water. This healthy seagrass baffled marine biologist Brent Hughes. The scientist expected this estuary to be overrun with algae, causing the seagrass to die. Why was the seagrass thriving? As Brent investigated, signs pointed to an unexpected player helping to keep the seagrass healthy: sea otters! What do these top predators have to do with an aquatic grass at the opposite end of the food chain?

Un audio delicioso con canciones y cuentos. El audio trata de "Davey", un perro que acompaña al niño en el audio utilizando números, colores, adjetivos y mucho más. El audio está destinado a niños de entre dos y seis años.

Son 12 canciones sobre animales que repasa las estructuras gramaticales del inglés. Toda la familia disfrutará de las canciones marchosas y pegadizas y aprenderá inglés cantando sin darse cuenta.