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.
Plants use a process called photosynthesis to make food. Only plants can produce their own food. That's why they are called producers. Animals that eat only plants are called herbivores. Herbivores are consumers because they eat plants to survive. Deer, grasshoppers, and rabbits are all consumers. ... plants are called producers because they make their own food using sunlight, air, nutrients and water. ... that herbivores are animals that eat only plants. ... moose are the largest member of the deer family.