Bilateral Symmetry

Below is the details of 'Bilateral Symmetry'.

 

Bilateral Symmetry 630 mya

Animals evolve bilateral symmetry (a defined "top" and "bottom") as seen in early worm fossils.
Source: http://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life.html?page=2 (New Scientist)

Keywords: animal, evolution, fossils