Air: Air is a homogeneous mixture of gases. The composition of air varies slightly depending on location and altitude, but the major components are nitrogen (78%), oxygen (21%), and argon (0.9%). Air also contains trace amounts of other gases, including carbon dioxide, water vapor, and noble gases.

Blood: Blood is a heterogeneous mixture of cells, plasma, and platelets. The cells in blood include red blood cells, white blood cells, and platelets. Plasma is the liquid component of blood, and it contains proteins, electrolytes, and hormones. Platelets are small, disk-shaped cells that help to stop bleeding.