NSES Content Standard C
Life Science: Organisms and their environments  
Grades K-4, page 129  

An organism's patterns of behavior are related to the nature of that organism's environment, including the kinds and numbers of other organisms present, the availability of food and resources, and the physical characteristics of the environment. When the environment changes, some plants and animals survive and reproduce, and others die or move to new locations. 
 

 
Benchmark 5D The Living Environment: Interdependence of Life
Grades 3-5, page 116
For any particular environment, some kinds of plants and animals survive well, some survive less well, and some cannot survive at all.

Benchmark 5D The Living Environment: Interdependence of Life
Grades 3-5, page 116
Changes in an organism's habitat are sometimes beneficial to it and sometimes harmful.

Benchmark 5D The Living Environment: Interdependence of Life
Grades 6-8, page 117
In all environments--freshwater, marine, forest, desert, grassland, mountain, and others--organisms with similar needs may compete with one another for resources, including food, space, water, air, and shelter. In any particular environment, the growth and survival of organisms depend on the physical conditions.

Benchmark 5F The Living Environment: Evolution of Life
Grades 6-8, page 124
Individual organisms with certain traits are more likely than others to survive and have offspring. Changes in environmental conditions can affect the survival of individual organisms and entire species.