Because we need oxygen for us to live...... Because we need oxygen for us to live......
Yes.
this is necessary cause it helps you breath
Schwann cells
Microscope.
Haploid cells only have half the necessary amount of DNA (sex cells). Diploid cells have a full set of DNA (body cells).
They inject it from pores and outside cells
hemoglobin
insulin
cells
no never
calcium, potassium, sodium
Iron is necessary to carry oxygen molecules to your cells.