The major cause of staghorn corals decline is, that some organisms in the same aquatic environment affect them negatively and harm them a lot.
Corals may be defined as marine invertebrates organisms that are composed of colonies of skeletons underwater bodies.
Staghorn is so vulnerable because its branches are so fragile and break by any disturbances. This causes the staghorn to ultimately disintegrate and die.
Therefore, it is well described above.
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