sentences:  For plants, key resources include sunlight, nutrients, water, and a place to grow.Resources can be consumed by an organism and, as a result, become unavailable to other organisms.Competition for resource varies from complete symmetric (all individuals receive the same amount of resources, irrespective of their size) to perfectly size symmetric (all individuals exploit the same amount of resource per unit biomass) to absolutely size-asymmetric (the largest individuals exploit all the available resource).