Different types of plants and animals inhabit the Earth. As a basis for understanding this concept, students:
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Explain that most living things need food, water, and air.
Observe and describe that there can be differences, such as size or markings, among the individuals within one particular plant or animal group (e.g., maple trees, zebras). Variation is a normal characteristic of many kinds of living things.
Observe and explain that animals eat plants and/or other animals for food.
Recognize that animals (including humans) and plants are living things that grow, reproduce, and need food, air, and water.
Identify the external features that local plants and animals have (such as those found in schoolyards or in city neighborhoods) that enable them to survive in their environment.