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.
Humans also use animals as sources of food and clothing. Plants benefit from animals. 1  Animals are used by some plants to disperse seeds. 2  Some animals can eat other plant-eating animals. 3  Bees and other insects help pollinate flowers.4  Earthworms aerate the soil so that the roots of plants can better obtain oxygen.he plants and animals depend on each other. Animals and humans depend on plants. Animals need food, protection and shelter. In human terms, food, clothing and shelter. 1  Plants are used as sources of food and goods for humans. 2  They can be used for shelter.