NSES Content Standard C 
Life Science: The characteristics of organisms  
Grades K-4, page 129  

Each plant or animal has different structures that serve different functions in growth, survival, and reproduction. For example, humans have distinct body structures for walking, holding, seeing, and talking. 

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 6C The Human Organism: Basic Functions
Grades K-2, page 136
The human body has parts that help it seek, find, and take in food when it feels hunger--eyes and noses for detecting food, legs to get to it, arms to carry it away, and a mouth to eat it.