Machines help to simplify human work., A constellation is a group of stars which appears to form a certain pattern in the sky that can be seen at night., The Earth rotates on its axis and at the same time, revolves around the Sun., The Moon rotates on its axis and at the same time, revolves around the Earth., Matter exists in three states that are known as solid, liquid and gas., The characteristics of a rusty objects are reddish-brown, rough surface and brittle., The presence of water and air cause rusting of objects made of iron., Heat is a form of energy., A material becomes hotter when it gains heat and becomes colder when it loses heat., Temperature is the degree of hotness or coldness of a material., Thermometer is used to measure the temperature., The survival of an animal species is the ability for animaals to maintain their species to avoid extinction., A food chain is the food relationship among living things., A food web is aa combination of more than one food chain., The skull protects our brain from injury., The ribs protect the internal organs such as the lungs and heart., The backbone provides support for the body., The bones of the hands and legs provide support and movement., A joint is a place where two or more bones are joined together., Joint allow movement and flexibility of the body.,

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