“As for when “life” begins: The gametes that join to form the zygote that becomes the embryo are all alive. Life is no longer something that “begins.” It is something that is transferred from one living thing to another. You carry within your cells a genetic code that connects you with every other living thing on the planet—as well as every other dead thing that was once alive. Plants, trees, bacteria, human embryos, etc., they carry remnants of the same genetic markers that you do because you are all related by a common ancestor (or several). Life began on this planet over a billion years ago—it hasn’t begun since.”
— from an internet post by BreakerBaker (Andrew).