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Darya [45]
3 years ago
9

A. What is likely to happen to coral reefs if atmospheric carbon dioxide

Biology
1 answer:
sveticcg [70]3 years ago
5 0

Answer:

Coral reefs are under threat if atmospheric carbon dioxide levels continue to rise, new research has shown. When CO2 dissolves in the ocean, it raises the water's acidity level. This prevents a build up of calcium carbonate, which corals draw from seawater to build their skeleton

Explanation:

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In a hydra, digestion is completed intracellularly.

Hence option (a) is correct.

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Like most other cnidarians, hydras have a pretty straightforward digestive system.

They have a two-way digestive system, which differs from mammals in that food and waste enter and exit through the same aperture. A "blind gut" is the name for this configuration.

The center of the hydra's body is occupied by its digestive tract.

Learn more about Hydra here brainly.com/question/1808325

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