The “Tree of Life,” which shows relationships among all forms of life to the extent we know them, is no longer a tree. It has taken the form of an arc with many thick branches. On seeing it depicted this way, one is inclined to remember Charles Darwin’s words:
It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by laws acting around us (the laws of nature).
On the Origin of Species (First Edition), by Charles Darwin