3. Recall your model watershed and the scenarios about which you wrote. What are several ways humans can prevent or control environmental changes? Is it important for humans to prevent these changes? Why, or why not?​

Asingle celled organism does not contain any specialized organelles and thus the transport of materials occurs through cytoplasm. moreover, this transport is facilitated by the cytoskeletal  fibres or microtubules within the cell which make it easier for the materials to be transported within the cell.