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.
As mentioned in the title, we (the living organisms) all totally depend on the plants. The fundamental issue here is about energy. Energy creates and sustains life. Plants have the unique ability to turn solar energy into chemical energy, using a process we term âphotosynthesisâ. No other organisms can, so we all depend on the plants to start