The development of a true coelom between the ectoderm and the mesoderm represents a true evolutionary advance over the pseudocoelomate body plan. true or false.

The answer is True.

Explanation:

The development of a coelom allowed organisms to grow more cylindrically by giving them more space for their organs to evolve. Also, the coelom creates perfect space for nervous system upgrades such as vertebrae or more. Pseudocoelomates only had a little space where no further evolution could happen.

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

c

explanation: