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The expulsion of zooxanthelle due to unfavorable conditions is called?

1) Symbiosis
2) Bleaching
3) Photosynthesis
4) Reproduction

User Fabien
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Final answer:

The expulsion of zooxanthellae due to unfavorable conditions is called bleaching, which can lead to coral death if prolonged.

Step-by-step explanation:

The expulsion of zooxanthellae due to unfavorable conditions is called bleaching. This phenomenon is a result of stress factors such as elevated sea temperatures caused by climate change. When corals bleach, they lose the symbiotic algae that provide them with food, leading to a loss of color and potentially the death of the coral if the conditions persist. The relationship between coral and zooxanthellae is a type of symbiotic relationship where both organisms benefit, known as mutualism.

User Ivan Mamontov
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