When Does Life Begin?

by | Oct 27, 2021 | Biology | 1 comment

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We believe all human life is sacred and of inestimable worth in all its dimensions, including pre-born babies, the aged, those with disabilities, and every other stage or condition from fertilization to natural death.

How do scientists distinguish between life and non-life?

A scientific textbook called “Basics of Biology”1 gives five characteristics of living things; these five criteria are found in all modern elementary scientific textbooks:

  1. Living things are highly organized.
  2. All living things have the ability to acquire materials and energy.
  3. All living things have the ability to respond to their environment.
  4. All living things have the ability to reproduce.
  5. All living things have the ability to adapt.

According to this elementary definition of life, life begins at fertilization, when a sperm unites with an oocyte. From this moment, the being is highly organized, has the ability to acquire materials and energy, has the ability to respond to his or her environment, has the ability to adapt, and has the ability to reproduce (the cells divide, then divide again, etc., and barring pathology and pending reproductive maturity has the potential to reproduce other members of the species). Non-living things do not do these things. Even before the mother is aware that she is pregnant, a distinct, unique life has begun his or her existence inside her.

Medical science already refers to a spontaneous heart rhythm and the presence of brain waves to determine whether someone is alive at the other end of the spectrum of human existence. In simplistic terms, if an organ donor is in an automobile accident and is on life support in a hospital, the physician cannot “pull the plug” and donate the patient’s organs to others unless the patient is “brain dead” and his heart is not beating on its own. If the medical community maintained consistency with this generally accepted medical definition of human life, then we would condemn every abortion after the time when the average woman discovers she is pregnant. Every abortion, by the generally accepted standards of medical science, kills an innocent human life.


  • Basics of Biology, Carol Leth Stone, Greenwood Publishing Group, January 1, 2004, ISBN: 0-313-31786-0
  • American Life League, Retrieved: July 31, 2013, http://www.all.org

1 Comment

  1. Albert Charles Rees, MD

    Is the question “When does (human) life begin?” misleading and unjust? Before and at conception, ovum and sperm are living; alive they unite to produce a living, unique human. Not misleading and serving justice better is the question “When does life end?”


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