adolescence the stage of life after childhood. Boys and girls develop in different ways. adulthood the stage of life when the body stops growing and is ready to have children. angry when you feel angry, you feel very annoyed. cell the basic unit of life. childhood the first stage of life. Babies and children grow and change very fast. emotion a feeling, which can be caused by the situation that you are in. exercise to do a physical activity that keeps you healthy and happy. good posture sitting and standing correctly. happy you feel happy when something pleases or satisfies you. head the part of the body where the face and the brain are located. healthy food food that keeps your body working correctly. hygiene the practice of keeping your body and your home clean and healthy. leisure time spent doing things you enjoy. life process a process that all living things have in common. limb an arm or a leg. nutrition a life process by which living things get energy and raw materials from food. old age the last stage of life. organ the part of the body that carries out the life processes. reproduction a life process by which living things have offspring similar to themselves. sad when you feel sad, you feel unhappy. sensitivity a life process by which living things sense and respond to what happens around them. sleep to rest your mind and body. surprised you feel surprised when something unexpected happens. tissue a group of cells of the same type that join together. trunk the central part of the body. K E Y VO C A B U L A RY · We have healthy habits WRITE a definition on a strip of paper. Your partner reads it and guesses the word. Take turns to write and guess. 1 146 · o n e h u n d r e d a n d f o r t y - s i x
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