Cnidarians have become more complex in terms of organisation than the poriferan as they have developed a tissue level organisation,they show locomotion , exhibit polymorphism and a radial symmetry.
This means that cnidarians evolved later than poriferans and are adapted to more competitive and complex environment.
Explanation:
- Poriferans are pore bearing animals , they have cell specialization but no tissue level organisation while cnidarians are diploblastic and exhibit tissue level organisation.
- Poriferans are asymmetrical organisms hence are primitive to the radially symmetrical cnidarians.
- poriferans obtain nutrition mostly through filter feed while cnidarians have a gastro vascular cavity for digestion.
The appropriate response is active transport. Active transport is the development of particles over a cell layer from a district of their lower focus to a locale of their higher fixation—toward some inclination or another deterring factor.
Active transport utilizes cell vitality to move them against an angle, polar repugnance, or other resistance.
Cell nucleus but some are found in the mitochondria
they proved that DNA is the carrier of the genetic information. First, they grew phages in a medium containing radioactive sulphur. This marked all the proteins of the phage radioactive. They then used this phage to infect bacteria.
