Answer:
Shape of Red Blood Cells Erythrocytes are biconcave discs with very shallow centers. This shape optimizes the ratio of surface area to volume, facilitating gas exchange. It also enables them to fold up as they move through narrow blood vessels.
No they cant be mechanical because then something would have to generate their rays through the inventing of a machine.
Everything we have today is because of the industrial revolution
In animals, a cleavage furrow begins to form between the soon-to-be sister cells. The lipid bilayer is pinched until the cells are finally separated. In plants, the cell walls are made up of cellulose, so they won't bend. Instead, a new wall is grown in between the the two new cells.
Hope this helps. :D
