Because its members are so different from one another. Protists include microscopic organisms that are not bacterias, not animals, not plants and not fungis
When it shifts inwards, it indicates that the economy is shrinking due to a failure in its allocation of resources and optimal production capability. A shrinking economy could be a result of a decrease in supplies or a deficiency in technology.
C)homeostasis phenomena of adjusting to environment
No because sugar is transported into the cell by active transport.