Identify carbon, hydrogen, oxygen, nitrogen and phosphorus as common elements of living matter.
Energy flows and matter recycles through an ecosystem.
Recycling of Materials
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Identify elements as substances that contain only one kind of atom; and explain that elements do not break down by normal laboratory reactions, such as heating, exposure to electric current, and reaction to acid.
Recognize that all matter is composed of minute particles called atoms; and explain that all substances are composed of atoms, each arranged into different groupings.