The theory categorizes four production levels of grassland agro- ecosystem: pre-plant production, plant production, animal production, and post-biological production. It considers the relationship ...

These charismatic, rabbit-size rodents live on North America's prairies and open grasslands in only a fraction ... listening posts near exits, so animals can safely keep tabs on the movements ...

The animals in a biome depend on plants for food. The plants in a biome can also depend on the animals to spread pollen and seeds so new plants can grow. So both plants and animals rely on each ...