Answer:
Lobe-finned fish are thought to be the close relatives to tetrapods because of the fact that the fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods.
Explanation:
Development of the ozone layer
>> sharks and trilobites abundant in oceans
>> plants and animals colonize land
>> dominance of reptiles >> dominance of mammals
<span>Coronal suture.
This is the ssuture framed between the two parietal bones and the frontal bone. At the intersection of coronal, sagittal and frontal sutures is the foremost fontanelle which is open during childbirth and generally combines at around 18 two years after birth.</span>
This process requires large volumes of water to pass through absorption surfaces to get enough oxygen into their bodies using their mouths and gills. These body parts work like a pump to keep water moving over the gas absorption surfaces of the gills.
Irregularly shaped area betweenthe two lungs, contains thetrachea. Diaphragm. muscular sheet that contracts to enlarge the thoracic cavity and draw air in. Pleura. Each lung is surrounded by a double layer serous membraneknown as pleura.
