Final answer:
The correct sequence is cell division, cell migration, cell differentiation, and cell death for limb formation. The blastocyst contains the most cells compared to other early developmental stages. Organogenesis, including the differentiation of cells into organs, follows the formation of the germ layers.
Step-by-step explanation:
The correct order of cellular processes for limb formation from first to last is cell division, cell migration, cell differentiation, and cell death. Initially, cells engage in division to increase their numbers. Following this, during the process of migration, cells move to their correct locations. Once they are in place, they undergo differentiation where they develop into specific cell types needed for limb formation. Finally, cell death (also known as apoptosis or programmed cell death) helps sculpt the limbs by removing unnecessary cells, making the structure defined.
In the context of embryonic development discussed here, the blastocyst contains the most cells as compared to the morula or blastocoele. Differentiation leads to cells taking on specialized functions and is a key process during which cells in the ectoderm layer may develop into epidermal skin cells, while muscle tissues arise from the mesoderm layer. Organogenesis, the formation of organs from these differentiated cells, is part of the broader process of embryonic development involving the three germ layers: ectoderm, mesoderm, and endoderm, and is regulated through complex signaling pathways.
Gastrulation leads to the formation of these three germ layers, after which the process of organogenesis begins, driving the formation of organs through continued cellular differentiation.