Scientists do not currently have an explanation for the origin of life itself. Here are a few ideas;

All life evolved from primitive, cellular colonies, 3.5 billion years ago. We know that cells in living things have constant chemical reactions, which happen in sequence and are called metabolic pathways. Amino acids and sugars combine to create structure such as genes, protein and cell membranes.
Scientists didn't understand where these chemicals of life came from, so they referred to this as the 'vital force.'
Friedrich Wohler accidentally created urea in his lab, which challenged the belief that urine could only be made inside a living creature.
Life may have emerged from non-living chemistry. Amino acids and sugars have been found in meteorites, which means they are being produced naturally in the solar system.
When chemicals are given energy, they either break or make bonds. They assemble themselves into formations that can resemble the structure of a cell or strand of DNA.

	Created by Summer Pearce over 8 years ago

AS - Level (Year 1) Philosophy (3b) Challenges to Religious Belief: Science) Slide Set on Evolution, created by Summer Pearce on 27/01/2016.