NSES Content Standard C 
Life Science: Matter, energy, and organization in living systems
Grades 9-12, page 186

As matter and energy flows through different levels of organization of living systems--cells, organs, organisms, communities--and between living systems and the physical environment, chemical elements are recombined in different ways. Each recombination results in storage and dissipation of energy into the environment as heat. Matter and energy are conserved in each change.
 

 
Benchmark 5E The Living Environment: Flow of Matter and Energy
Grades 6-8, page 120
Over a long time, matter is transferred from one organism to another repeatedly and between organisms and their physical environment. As in all material systems, the total amount of matter remains constant, even though its form and location change.

Benchmark 5E The Living Environment: Flow of Matter and Energy
Grades 9-12, page 121
The chemical elements that make up the molecules of living things pass through food webs and are combined and recombined in different ways. At each link in a food web, some energy is stored in newly made structures but much is dissipated into the environment as heat. Continual input of energy from sunlight keeps the process going.