Final answer:
Chemical signaling indicating apoptosis is recognized by neighboring cells, which is vital for eliminating unwanted or damaged cells and is important for proper development.
Step-by-step explanation:
The chemical signaling molecules on the surface of dying cells, which indicate that apoptosis is occurring, are recognized by neighboring cells. Therefore, the correct answer to the question is A) Apoptosis; neighboring.
Apoptosis, also known as programmed cell death, involves a series of biochemical events leading to a cell's death. This process is essential for maintaining health by removing unwanted or damaged cells. Neighboring cells can recognize these signals through cell-surface receptors which can trigger apoptosis in the signaling cell. This tightly regulated process is critical for development, such as during embryogenesis when cells between digits must die for proper formation of fingers and toes.