Two aquatic animals: one has pores for water flow, the other uses tentacles to capture prey. Which key structural difference explains their feeding strategies?
Presence of tissues in the tentacled animal
The pore-bearing animal is a sponge (phylum Porifera). Sponges are at the cellular level of organisation - they have no true tissues, so water simply flows through their pores (ostia) and specialised choanocytes filter tiny food particles from it.
The tentacled predator is a cnidarian such as Hydra or a jelly-fish (phylum Cnidaria). Cnidarians have reached the tissue level of organisation; their tentacles are made of coordinated muscular and nervous tissues that can extend, contract and fire stinging cells (cnidocytes) to seize prey.
Neither group possesses segmentation, so that option fails; sponges likewise have no hard internal skeleton driving cnidarian feeding, and sponges are asymmetrical rather than bilaterally symmetric.
Hence, the key structural difference is the presence of true tissues in the tentacled animal.
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