Answer:
Cellular differentiation is the process in which a cell changes from one cell type to another. Usually, the cell changes to a more specialized type. ... Differentiation continues in adulthood as adult stem cells divide and create fully differentiated daughter cells during tissue repair and during normal cell turnover.
Co-formation theory suggests that the moon and the earth formed at the same time from dust from the solar nebula that formed the Sun.
Initial conditions and chance play roles in the process of succession so if the ecosystem is in a good condition and chance is on it's side (no natural disasters or human interventions occur), succession can't happen because there is no destroyed area to build new upon.
