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matter

Matter is anything that takes up space and has mass. Atoms or parts of atoms form all matter. It is everything from the tiniest electron to the planets and stars. ... read more

the parts of plants

Plant Cells ... read more

the human body organs and systems

Your body is like a complex machine. Many parts make up your body and work to keep you going. Some parts, like your eyes and hands, are easy to see. Some parts, like your vocal cords, hide inside your body. When you hum, the vibrations you feel are your vocal cords at work. Some parts of the body are ... read more

types of plants

There are many kinds, shapes, and sizes of plants on Earth. Among them, algae, mosses, liverworts, ferns, and some trees are non-flowering plants. Among the flowering plants are the grasses and other non-woody, herbaceous plants. Shrubs, some vines, and many kinds of trees are woody plants. ... read more

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more