Darwin wrote many of the premises of 'the theory of evolution by natural selection' by noting differences in the of closely related while studying in the galapagos islands. a) feet, finches. b) beaks, finches. c) feather color, tortoises. d) dietary preferences, tortoises.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.