In the latter case the resistance is caused by dissipation of mechanical energy when the configuration or the direction of flow is sharply changed, by the formation of vortices and secondary flows as a result of the flow breaking away, by the centrifugal forces, etc.
Why do animals depend on plants. Plants give animals the food and shelter they need. Herbivores, which are plant eating animals, rely on plants to provide them with a regular source of food. They also provide shelter to may animals, both large and small.
Plants and animals need water from the hydrosphere, minerals from the lithosphere and gases from the atmosphere. The air, water, and land provide homes for all the various forms of life. Refer Image 3. The environment contains all the factors that surround and influence the biotic and abiotic things within it.