Това ще изтрие страница "If an Enemy Germ Invades You". Моля, бъдете сигурни.
Red blood cells, or erythrocytes, contain the hemoglobin that carries oxygen and carbon dioxide across the body. Hemoglobin provides pink blood cells their Characteristic color. When it's oxygen-rich, it appears reddish
Това ще изтрие страница "If an Enemy Germ Invades You". Моля, бъдете сигурни.