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.
Animals depend on plants for food as plants produce food and energy which animals can't, so, herbivores eat plants to get energy, carnivores eat herbivores and other carnivores for energy and omnivores eat all four, plants, herbivores, carnivores and also other omnivores for energy.
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.