高いところの葉を食べるのに有利だったから長い首を持った個体が生き残ったThis longer necks may have due to the effect of mutationinitially. However as it was favorable, this was propagated overthe generations.
突然変異と遺伝によって新しい性質をもった世代を産む突然異変によって長くなったと言われるEvolution through natural selectionInitial Population of Animalsmillions of yearsStruggle for Existence-Survival of the FittestSurviving Individuals Reproduce, Propagate Favorable Characteristics