Deltas
erosion
sand dunes
(not sure about this one) key currents
Answer:
Control of the cell cycle is necessary for different reasons. When the cell cycle are not regulated, cells could constantly undergo cell division without any form of control which will lead to cancer.
Internal regulation of the cell cycle is necessary to alert the passage of one phase to the next at a set given time. This helps in the overall metabolism of the body.
A. Moisten and filters incoming air
Animal dander would be the answer you're looking for.
Hope this helps :)
