人类进化史上具有决定意义的一步是

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liberated Human beings have the chance to learn to use tools While the use of tools is the biggest difference between human beast also According to the law of survival of the fittest, many creatures can't adapt to climate change is eliminated, part of a cohort for survival was forced down from the tree to the ground. Had they lived in the trees, picking wild fruit to eat, don't need to worry about the food. Now, have no the ready-made food, in order to survive, they must to find a new food and to capture the beast. In this process, their limbs and brain development. Hunting and shipping needs, make the function of limbs gradually separated. Engels once pointed out, walk upright from ape to man change the decisive step in the process. A cohort of upright caused the division of the front and hind legs, arms activities engaged in by more and more. After a long period of training, evolution, from occasional discovery and use of natural tools, such as hunting, with sticks and stones to use natural tools, gradually learned to manufacture and use simple tools. Under the harsh environment, they want to fight with wild animals and nature, the brotherhood of division of labor, upright to make their vision gradually open, more and more get the information from nature, the brain capacity increase, has begun to develop the brain. Engels said: "Labour created man himself." after a long process, their body and get a bigger development wisdom, they are looking for more food sources, learned to agricultural farm.
解放了出来 人类才有机会去学会使用工具 而使用工具是人类也野兽最大的区别 根据适者生存的规律,许多生物适应不了气候的变化被淘汰了,一部分古猿为求生存被迫从树上下来走向平地.原先他们在树上生活,采摘野果充饥,不用为食物而发愁.如今,现成的食物已不存在,为了生存,他们必须去寻找新的食物而去捕捉野兽.在这个过程中,他们的四肢和大脑开始发育.打猎和运送猎物的需要,使四肢的功能逐渐分离.恩格斯曾指出,直立行走是从猿到人转变过程中“具有决定意义的一步”.古猿的直立行走造成了前后肢的分工,前肢所从事的活动越来越多.经过长期的磨练、进化,从偶尔发现和使用天然工具,如用棍子和石块打猎,到经常使用天然工具,逐渐学会了制造和使用简单的工具.在恶劣的生存环境下,他们要与野兽及大自然进行搏斗,手足分工、直立行走使他们的视野逐渐开阔,从自然获得的信息越来越多,大脑容量加大,促使大脑渐渐发育.恩格斯说：“劳动创造了人本身.”在以后漫长的过程中,他们的身体和智慧得到更大的发展,他们寻找到了更多的食物来源,学会了农耕稼穑.

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