Which organelle is responsible for a newborn having distinctive toes and fingers instead of webbed digits? Cells lining the trachea have whiplike motile extensions on their free surfaces. What are...

Which organelle is responsible for a newborn having distinctive toes and fingers instead of webbed digits?

Cells lining the trachea have whiplike motile extensions on their free surfaces. What are these extensions, what is their source, and what is their function?