How did early land animals differ from those common today?

Early land animals differs from the land animals today because the early land animals are now extinct. These land animals are called the dinosaurs. These animals are under the Mesozoic era. Some early land animal are the Diadectes, Lycaenops, Moschops, and Edaphosaurus. Also centipedes are included as the early land animals.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c