In some areas, the barrier built to prevent uncontrolled movement of people across the border between the United States and Mexico consists of miles of 6-meter-tall steel beams placed four inches apart. Discuss the ecological effects of such a barrier. What types of organisms would be most adversely affected by this habitat fragmentation?

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

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