When is a fertilized egg considered living?

A fertilized egg is often considered living from the moment of fertilization, when the sperm and egg combine to form a zygote with a unique genetic identity. However, the definition of "living" can vary depending on scientific, philosophical, and ethical perspectives. Some argue that viability outside the womb or the development of certain characteristics marks the beginning of life. Ultimately, the determination of when life begins can be influenced by cultural, religious, and personal beliefs.