Final answer:
The development of the hollow, in biological contexts, requires cell differentiation and programmed cell death (apoptosis). These processes are essential for creating hollow structures in organisms such as blood vessels, ducts, and plant stems.
Step-by-step explanation:
The development of the hollow, likely referring to structures like the hollow stem of a plant or a hollow organ, generally requires two critical ingredients: cell differentiation and programmed cell death (apoptosis). During the process of development in organisms, cells often differentiate into various types performing specific functions.
Apoptosis then plays a role in eliminating the cells in certain regions, leading to the creation of hollow spaces. This process is vital for the formation of various tubular structures such as blood vessels, ducts in organs, and the vascular system in plants.