This paper aims to explain the transition to multicellularity as a consequence of the evolutionary response to stress. The proposed model is composed of three parts. The first part details stochastic biochemical kinetics within a reactor (potentially compartmentalized). where kinetic rates are influenced by random stress parameters. https://safeersappliancers.shop/product-category/beko-xdvg675sm-dark-silver-mirrored-gas-cooker-double-oven-60cm/