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.
The names depend mostly on what the organism eats and how it contributes to the energy of the ecosystem. 1  Producers - Plants are producers. 2  Consumers - Animals are consumers. 3  Decomposers - Decomposers eat decaying matter (like dead plants and animals).