What are the three different methods that can lead to primary succession?

Examples of disturbances that cause primary succession include retreating glaciers, volcanic eruption and the erosion of sand dunes. Human activity can also be a cause of primary succession, such as the creation of a paved surface. These types of disturbances leave bare rock exposed or otherwise accessible.

Explanation:

b is dominant over the allele for the white fur.

cell division is not regulated in tumor cells.