Evolution “tinkers”

“Today modern humans, us, are the only surviving homo species.”

Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large.

• The atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons.
• Atoms form molecules which are chemical structures consisting of at least two atoms held together by one or more chemical bonds.
• Many molecules that are biologically important are…