NSES Content Standard C  Life Science: Matter, energy, and organization in living systems Grades 9-12, page 186 The complexity and organization of organisms accommodates the need for obtaining, transforming, transporting, releasing, and eliminating the matter and energy used to sustain the organism.

 
Benchmark 5A The Living Environment: Diversity of Life
Grades 6-8, page 104
Animals and plants have a great variety of body plans and internal structures that contribute to their being able to make or find food and reproduce.

Benchmark 6A The Human Organism: Human Identity
Grades 6-8, page 129
Like other animals, human beings have body systems for obtaining and providing energy, defense, reproduction, and the coordination of body functions.

Benchmark 6C The Human Organism: Basic Functions
Grades 6-8, page 137
To burn food for the release of energy stored in it, oxygen must be supplied to cells, and carbon dioxide removed. Lungs take in oxygen for the combustion of food and they eliminate the carbon dioxide produced. The urinary system disposes of dissolved waste molecules, the intestinal tract removes solid wastes, and the skin and lungs rid the body of heat energy. The circulatory system moves all these substances to or from cells where they are needed or produced, responding to changing demands.