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 Water is the second factor necessary for animals to survive. 2  Make a list of different areas water can be obtained by animals. 3  Puddles, springs, streams, and ponds are places where animals can get water.  4 We've named two factors necessary for animals to survive: food and water. 5  There are two more. Omnivores can live in many places because they eat both plants and animals. 2  Have students name examples of each group. 3  List on overhead.  4 Now that we've discussed that animals need food to survive and the different types of food animals need, who can name the second factor necessary for animals to survive.