In what vertebrates first appeared leverage five-fingered limbs and how did this increase the level of their organization?

1) Lever limbs first appeared in amphibians, although joints arose already in fish.
2) Lever limbs allowed the animals to actively move both in water and on 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.