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.
1 Plants, like animals, must have food in order to survive. 2  But, unlike most animals, plants make their own food or energy source through the process of photosynthesis. 3  Plants use this food, in the form of glucose, in the same way that animals use the glucose they eat: it is converted into ATP by the mitochondria.