Hullo Biologists -
I've been trying, in vain, to think of a natural (ie living) thing that is not symmetrical, but it seems like symmetry rules.
Obviously, living things develop under the influence of outside forces (e.g. trees bent by prevailing winds, three-legged cats); but without such forces, aren't all living things symmetrical? At root (ha!), trees have the same dendritic symmetry; even lichens seem to spread with an alarming regularity.
So, has anyone got any examples of living things that aren't symmetrical?
And, also, why is symmetry so prevalent: what are the mechanisms that cause it?