Sorry, this item sold. Have isotope make something just for you, or try these other items:
Never forget that we are the heir of eons of struggle by our ancestors... even the microscopic ones!
Evolution is the change in the inherited traits of a population from one generation to the next. These traits are the expression of genes that are copied and passed on to offspring during reproduction. Mutations in these genes can produce new or altered traits, resulting in heritable differences between organisms. New traits can also come from transfer of genes between populations, as in migration, or between species, in horizontal gene transfer. Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through natural selection or randomly through genetic drift.
All of our shirts are available in SMALL, MEDIUM, LARGE, & XL
Please specify what size you'd like after purchase.