Natural sciences deal with the physical world and include astronomy, biology, chemistry, geology, and physics. Applied science is the process of applying scientific knowledge to practical problems, and is used in fields such as engineering, health care, information technology, and early childhood education.
If you're talking about excel then you would select the cell with the label you want and click "Format Painter". Then, you click and drag it down the first 10 and it will automatically apply that same label to all the cells.
I think the answer would be needs. Hope this helps.
If the producer were to disappear then all the other organisms will either go extinct, survival of the fittest, or have to adapt to the change.