by jimwalton » Wed Feb 15, 2017 2:49 pm
Are you defining "life" as "fully developed" or as "having brain activity"? I'm not convinced that's a very scientific approach. Cells don't have brains but they are sophisticated machines that are distinctly alive. Some babies when they're born as premies aren't even fully developed, but no one would argue, "Then they aren't alive."
Within the first week cells in the zygote are reproducing. The organism is a separate organism from his/her mother or father, with a distinct and unique genetic code. It's alive (growth, reproduction, use of energy, organized, adapting, etc.).
In the 3rd week after conception, the primitive groove forms on the ectodermal surface of the embryonic disk. The spinal cord and brain will develop from this structure. By week 4 the heart is beating—it's alive. Blood is flowing.
By five weeks, the neural tube is enlarging. By 6 weeks the brain has developed into five areas and some cranial nerves are visible. Brain waves can first be measured by week 8. It's alive.
I'm trying to figure out what your point is. Help me understand.
Are you defining "life" as "fully developed" or as "having brain activity"? I'm not convinced that's a very scientific approach. Cells don't have brains but they are sophisticated machines that are distinctly alive. Some babies when they're born as premies aren't even fully developed, but no one would argue, "Then they aren't alive."
Within the first week cells in the zygote are reproducing. The organism is a separate organism from his/her mother or father, with a distinct and unique genetic code. It's alive (growth, reproduction, use of energy, organized, adapting, etc.).
In the 3rd week after conception, the primitive groove forms on the ectodermal surface of the embryonic disk. The spinal cord and brain will develop from this structure. By week 4 the heart is beating—it's alive. Blood is flowing.
By five weeks, the neural tube is enlarging. By 6 weeks the brain has developed into five areas and some cranial nerves are visible. Brain waves can first be measured by week 8. It's alive.
I'm trying to figure out what your point is. Help me understand.