Differences between the three domains of life show up in conservative structures such as:

1. A conservative structure is one that changes very slowly, so deep splits still show in it. 2. Fundamental divisions in life between the three domains are reflected in major structural differences in otherwise conservative structures. 3. Those structures are the components of ribosomes and the structures of membranes. 4. Wings, leaves and body size change far too readily to record a three-billion-year split. 5. That is why molecular structures rather than gross anatomy define the domains. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 18 'Evolution and the Origin of Species', sections 18.1-18.3_