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However, adaptation to climate change has been demonstrated in many cases. These are usually due to a shift in coral and zooxanthellae genotypes. These shifts in allele frequency have progressed toward more tolerant types of zooxanthellae.

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es gerente del proyecto y que sabe la importancia del mismo más qual definirlo expresa:   “Les invito de corazón a pensar en este

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If the stressful conditions persist, the polyp eventually dies.[23] Zooxanthellae are located within the coral cytoplasm and due to the algae's photosynthetic activity the internal pH of the coral can be raised; this behavior indicates that the zooxanthellae are responsible to some extent for the metabolism of their host corals [24] Reproduction[edit]

Tabulate corals occur in limestones and calcareous shales of the Ordovician and Silurian periods, and often form low cushions or branching masses of calcite alongside rugose corals.

A flap (operculum) opens and its stinging apparatus fires the barb into the prey. The venom is injected through the hollow filament veja mais to immobilise the prey; the tentacles then manoeuvre the prey into the stomach. Once the prey grupo coral is digested the stomach reopens allowing the elimination of waste products and the beginning of the next hunting cycle.[16]:24 Intracellular symbionts[edit]

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Planula larvae exhibit positive phototaxis, swimming towards light to reach surface waters, where they drift and grow grupo coral before descending to seek a hard surface to which they can attach and begin a new colony. They also exhibit positive sonotaxis, moving towards sounds that emanate from the reef and away from open water.

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A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length. A set of tentacles surround a central mouth opening. An exoskeleton is excreted near the base.

Corals' many colors give it veja mais appeal for necklaces and other jewelry. Intensely red coral is prized as a gemstone. Sometimes called fire coral, it is not the same as fire coral.

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