What are the major evolutionary trends that developed among major vertebrate groups, speciffically those that allowed for the transition from aquatic to terrestrial life

Vertebrates are known to be animals with backbones.  The following are the evolutionary changes of vertebrates:  

*Jaws - Fishes before sucked and rubbed on their preys but now, they already have jaws that enable them to more efficacious in getting their preys.  

*Lungs and limbs - Animals on the sea need to adapt when they look for their preys on land, in turn, they had evolved to acquiring lungs for breathing and limbs for moving.  

*Endothermy - ‘Endo’ meaning internal and ‘therm’ meaning temperature. This gave animals’ bodies heat supply from burning the food they eat.  

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes