1. tetrapods are ( four-limbed animals ) . examples of tetrapods include (extanct and extinct amphibians , reptiles , and mammals )
2. Tetrapods first appear in the fossil record ( 367.5 ) million years ago .
3. Charles Darwin predicted that tetrapods evolved from ( a finned organism that lived in the water) . What observation leads do that hypothesis?( they have “fleshy fins” and “lobe fins”) .
5. Fish use ( gills ) to breathe underwater .
Nervous tissue. Hope this helps!
Protons- these have a positive charge
Electrons-negative charge
Neutrons- neutral charge
Answer: Embryonic stem cells
Explanation: Cell differentiation is the process whereby an immature cell evolves to specialized form to perform its function. It take place in Embryonic stem cells.
