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why do toucans have such big beaks

Toucans have large beaks in order to regulate their body temperature. ... read more

the parts of plants

Plant Cells ... read more

forces that shape the earth

Many forces can form, or shape, the Earth. Some of these forces come from deep within the ground. Volcanos and earthquakes cause major changes to the landscape. Other changes occur because of natural forces on the surface. Water and wind shape the planet every day. Human activity also plays a role in ... read more

waves, sound, and light

Light and sound are two of the most important forms of energy to humans. People see light and hear sound. Light from the Sun makes life on Earth possible. Sound is one of the most important ways that animals and humans communicate. Both sound and light travel as waves. Light also behaves like a partic... read more