A person who has allergies has a compromised immune system because the body's immune system O attacks its healthy cells.
O overreacts to an antigen.
• steals nutrients from healthy cells.
• responds to mutagens.

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?