As the sun heats the surface of the oceans, two layers of water result. These layers are separated by the Thermocline.
so your answer is thermocline.
1. Well developped offspring, and portable baby food despencing. Mamalian young are generally quite well developed when they are born, and the parent does not need to find any specific types of food for the new born since the mother already provides te perfect nutrition.
2. Internal heating allows mammals to remain quick and active in cold climates.
3. Fur is really effective and cheap to produce.
American paleontology research physical evidence to support the theory of evolution
Cytokinesis, which occurs at the end of Telophase in the process of Mitosis in Eukaryotic cells.
*Binary Fission occurs in Prokaryotes
