Do fertilised eggs divide to form a foetus

as a fertilized human egg divides , it first becomes a solid ball of cells , the morula. ... The initial flat sheet of embryonic cells folds and twists and grow to form a recognizable embryo , with a rudimentary head and a central cavity surrounded by three layers of cells .

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms