Insects are the largest group of animals on Earth. They have six legs, a body divided into three parts, and usually two pairs of wings. Bees, butterflies, ants, and beetles are insects.

Every animal lives in a special place called a habitat. A habitat provides the food, water, shelter, and space an animal needs to survive. For example, frogs live in wetlands where they can stay moist and catch insects.

Magnets are objects that can attract or repel certain metals, like iron and nickel. Every magnet has two poles—a north pole and a south pole. Opposite poles attract each other, while like poles push away.

Butterflies go through an amazing transformation called metamorphosis. The cycle begins when a female butterfly lays eggs on the leaves of a plant. When the eggs hatch, tiny caterpillars, or larvae, come out and begin eating the leaves.

Electricity is a form of energy that powers lights, computers, and so many other things we use every day. Electricity moves through circuits, which are paths that allow electric current to flow.

Every object moves because of forces. A force is a push or a pull. When you kick a soccer ball, your foot applies a force that makes the ball move. Friction is another force that happens when two objects rub against each other.

The skeleton is the framework of bones that supports the human body. It protects organs, like the skull protecting the brain and the ribs protecting the heart and lungs.

Clouds form when water vapor in the air cools and condenses into tiny droplets. Clouds can bring different types of precipitation, such as rain, snow, sleet, or hail.

Matter exists in three main states: solid, liquid, and gas. Solids have a definite shape, liquids take the shape of their container, and gases spread out to fill any space.

Animals have many ways to communicate with one another. Some use sounds, like birds singing or wolves howling, to warn others or mark territory.

Not all mammals live on land, many thrive in the ocean! Whales, dolphins, and seals are marine mammals. Even though they live in water, they must come to the surface to breathe air through lungs.

Weather and climate are related but not the same. Weather describes the conditions in the atmosphere at a specific time and place such as a rainy afternoon or a windy morning. Climate is the pattern of weather in a region over many years.