Team 4

The first article on the final day

This implies that the YMCs must have gone through at least one full crossing time before their presently observed age. Using the crossing time equation, tcross=(GMr−3vir)−1/2, and fixing the crossing time to 1 Myr we can solve for t, which is only dependent on the mass.(Ellis 2012)

When we look to the individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes us, is,\textbf{ that they generally differ much more from each other}, than do the individuals of any one species or variety in a state of nature.\verb|\cite{Wegerif_2014}| When we reflect on the vast diversity of the plants and animals which have been cultivated, and which have varied during all ages under the most different climates and treatment, I think we are driven to conclude that\textit{ this greater variability is simply due to our domestic productions having been raised under conditions of life that are not so uniform as, and somewhat different from, those to which the parent-species have been exposed under conditions of nature. There is, also, I think, some probability in the view propounded by Thomas Andrew Knight \href{(Wikipedia)}{}, that this variability may be partly connected with excess of food. It seems pretty clear that 1. organic beings must be exposed during several generations to the new conditions of life to cause any appreciable amount of variation; 2. that when the organisation has once begun to vary, it generally continues to vary for many generations.\verb|\cite{Matusov_2009,Bandura_1996}| No case is on record of a variable being ceasing to be variable under cultivation. Our oldest cultivated plants, such as wheat, still often yield new varieties: our oldest domesticated animals are still capable of rapid improvement or modification.