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一、必然性和可能性 1、身体发育、发达的主要因素 身体发育、发达的主要因素大体可分为内因和外因。内因最终归结为遗传,人类的遗传因子,近者说是从父母那里继承来的,远者说,是继承了人类二○○万年的历史。决定人类进化的主要因素是两脚直立行走,恩格斯在《劳动在从猿到人转变过程中的作用》一文中说:“这些猿类大概首先由于它们的生活方式的影响,使手在攀援时从事和脚不同的活动,因而在平地上行走时就开始摆脱用手帮助的习惯,渐渐直立行走,这就完成了从猿转变到人的具有决定意义的一步”。正是由于直立行走,解放了上肢,使之利于制造、使用工具,因而使大脑的重质增加,构造复杂化。人类从猿人,经过漫
I. Inevitability and Possibility 1. Main Factors for Physical Development and Development The main factors for physical development and development can be roughly divided into internal factors and external factors. The internal cause is ultimately attributed to heredity. The human genetic factor, in the near term, was inherited from the parents. In the distant sense, it is the history of 2,000 years of humanity. The main factor that determines the evolution of human beings is walking upright on both feet. Engels said in the article “The Role of Labor in the Transition from Skull to Man”: “These apes are probably affected by their way of life, so that their hands are climbing. Engaging in different activities with the feet, and thus walking away from the ground, begins to get rid of the habit of helping by hand and gradually walks upright, which completes a decisive step in the transition from 猿 to man." It is because of walking upright that the upper limbs are liberated, which facilitates the manufacture and use of tools, thereby increasing the weight of the brain and complicating the structure. Humans from the deaf, through the Man