Benchmark 5C
The Living Environment: Cells
Grades 6-8, page 112

Cells continually divide to make more cells for growth and repair. Various organs and tissues function to serve the needs of cells for food, air, and waste removal.
 

NSES Content Standard C
Life Science: Structure and function in living systems
Grades 5-8, page 156
Cells carry on the many functions needed to sustain life. They grow and divide, thereby producing more cells. This requires that they take in nutrients, which they use to provide energy for the work that cells do and to make the materials that a cell or an organism needs.

NSES Content Standard C 
Life Science: Structure and function in living systems
Grades 5-8, page 156
Specialized cells perform specialized functions in multicellular organisms. Groups of specialized cells cooperate to form a tissue, such as a muscle. Different tissues are in turn grouped together to form larger functional units, called organs. Each type of cell, tissue, and organ has a distinct structure and set of functions that serve the organism as a whole.