Cells of the same type grouped together to form tissues and then organs. For instance, during the third week from conception, you began to develop a skeletal system.
(‏ مزمور ١٣٩ :‏ ١٥‏ )‏ لَقَدِ ٱنْقَسَمَتِ ٱلْخَلِيَّةُ ٱلْأَصْلِيَّةُ ٱلَّتِي تَكَوَّنْتَ مِنْهَا إِلَى خَلَايَا جَدِيدَةٍ .‏