b. They show the body virus pieces to prepare it to fight that virus in the future.
The AB blood type has both A and B alleles.This illustrates principle of co-dominance
Your body needs two key nutrients: calcium and vitamin D. Calcium is the mineral that strengthens bones and teeth, and vitamin D helps the body absorb calcium while improving bone growth. So stuff like <em>yogurt, milk, salmon, tuna, and spinach.</em>
Cell theory is one of the foundations of biology. The observation of Robert Hooke,Anton Van Leeuewenhoek,Matthias Schleiden,Theodor Schwann,Rudolf Virchow, and others led to the devolepment of the cell theory.