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.
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.