The ability of all immunity cells to distinguish enemy cells from body cells, the ability of B cells to prepare a weapon to neutralise the enemy that they have never seen, their ability to carry these weapons as far as they have to be taken without adversely
There is no doubt that the giraffes did not acquire these traits by planning themselves in accordance with their needs. It is even more implausible to say that all these vital features were shaped over time through a gradual and accidental evolutionary process.
Inspired by the original Latin name for Wales, Cambria, Sedgwick named this period the Cambrian. According to dates published by the International Subcommission on Cambrian Stratigraphy in 2002, the Cambrian Period is regarded as having begun 545 million years ago