in the development of an human embryo, the fertilized egg travels and once fertilization has occured the fertilized egg or zygote undergoes repeated mitotic cell division called the cleavage.
Cleavage is one characteristic of minerals that refers to the tendency to split along planes of weakness.
The space between a woman's breasts is her cleavage. When women wears low-cut...
Biotite (black mica) and muscovite (white mica) are both minerals that have perfect basal cleavage--one direction. It cleaves into thin sheets. Feldspars (albite, oligoclase, andesine, labradorite,...