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.
Great question!Plants and animals are both, highly complex multi-cellular organisms, and there are many different types of plant and animal cells, all with different functions. Although there is alot of overlap in functions that are important to both plants and animals, there are certain things that only plants, or animals can do.