B. Magma with high silica content.
I’m pretty sure
Natural regeneration of forests and woodlands is the process by which new trees grow from seeds that have fallen and germinate where they have fallen. The biggest problem with natural regeneration is that is unpredictable. As a result, it cannot be used for commercial farming. For most of the last two or three hundred years, forests and woodlands have restocked by using transplants grown in nurseries. The young trees are planted in equidistant rows. This allows each tree the best possible change of optimal growth.
A. Migration (birds migraye to warmer climates during colder months)
Vascular tissue is located inside the pericycle of a root, which I believe would be considered the inner layer.