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why are circles 360 degrees and not a round number

Circles have 360 degrees due to the Sumerians’ observations of the Sun’s motion across the sky. ... read more

how we use animals

Humans use animals for a wide variety of purposes. Animals such as dogs, cats, and hamsters can be family pets. Horse racing and dog shows can provide entertainment for people. Scientists study animals. Some animals are eaten as food. Humans use many different products made from animals. Farmers raise... read more

animal adaptations

Animals have to adapt to the world in which they live in order to survive. Every species of animal has a different way of surviving. Species develop better ways of dealing with their environment over time. Traits that help an animal survive are passed on to the next generation. Traits that are not nee... read more

mating and reproduction in animals

Mating ... read more

how does chlorine clean swimming pools

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