1) the ancestors of amphibians lived in fresh water bodies, in the coastal zone, and coelacanth is adapted to life in the depths of salt bodies of water (ocean);
2) the ancestors of amphibians could breathe atmospheric oxygen with the help of the lungs, and coelacanth with atmospheric oxygen does not breathe;
3) the ancestors of amphibians could move along the bottom of the reservoir using paired fins, coelacanth using paired fins can only swim in the water.
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.