In all environments--freshwater, marine, forest, desert, grassland, mountain, and others&#151;organisms with similar needs may compete with one another for resources, including food, space, water, air, and shelter.
(organisms with similar needs; may compete; with one another; for resources, including food, space, water, air, and shelter)
organisms with similar needs
may compete
with one another for resources, including food, space, water, air, and shelter