ecology

Over the years a rock provides homes, shelter, food, and a place to sit for visiting animals and people.

A crooked fir tree keeps several animals safe from harm.

Describes the interdependence of some of the plants and animals that can be found in a milkweed patch.

An introduction to rain forests, examining their different layers, plants and animals, and human residents, looking at some of the products that originate in the rain forests, and discussing the need to preserve the tropical environments.

Describes how human behavior can affect butterflies, explains how people can take action to ensure their survival, and introduces eleven species.

Discusses the sources, ingredients, types, and nutrients of soil and the life forms that it supports.

Explains the concept of a food chain and how plants, animals, and humans are ecologically linked.

The many different animals that live in a great kapok tree in the Brazilian rain forest try to convince a man with an ax of the importance of not cutting down their home.

Describes the tropical rainforest and the life found there.

Describes the characteristics, various forms of plant and animal life, and destruction of the world's rain forests.