People need water, food, air, waste removal, and a particular range of temperatures in their environment. Even after birth, a human baby is unable to care for itself, and its survival depends on the care it receives from adults. The human body has parts that help it seek, find and take in food when it feels hunger. Senses can warn individuals about danger. The brain enables human beings to think and send messages to other body parts to help them work properly.
Different senses give different information.
Eating a variety of healthy foods and getting enough exercise and rest help people to stay healthy. People are both alike and different in many ways. Sometimes, in sharing and measuring there is a need to use numbers between whole numbers. It is possible to estimate quantities without knowing them exactly. Simple graphs can help to tell about observations.