Why was it possible for organisms to leave water on land?

Initially, life developed in the waters of the ocean, as ultraviolet radiation had a detrimental effect on them. And the appearance of the ozone layer as a result of the accumulation of oxygen in the atmosphere created the prerequisites for going to land.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.