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IELTS Free Online Writing Practice - Discuss the impact of ocean acidification on marine life.

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IELTS Writing Task 2 Topic: Discuss the impact of ocean acidification on marine life.

Model Answer:

Over the past few decades, the increasing level of carbon dioxide in the atmosphere has led to a phenomenon known as ocean acidification. This process has far-reaching consequences for marine life, affecting various aspects of their ecosystems. In this essay, we will explore the impact of ocean acidification on marine life and analyze the extent of its effects.

Ocean acidification is caused by the absorption of carbon dioxide from the atmosphere by seawater, which in turn forms carbonic acid. This process disrupts the balance of marine ecosystems, as it leads to a decrease in pH levels, making the ocean water more acidic. Acidification affects marine life in several ways:

1. Impact on Calcifying Organisms: Many marine species rely on calcium carbonate for their skeletal and shell structures. Ocean acidification reduces the availability of this compound, weakening the shells and skeletons of these organisms. Consequently, the survival rate of these species is significantly reduced, leading to a decline in marine biodiversity.

2. Impact on Reproduction: The acidic environment also affects reproduction among marine life. For instance, it can hinder the fertilization process in some species due to the chemical reactions that occur between acids and sperm. Moreover, it can lead to developmental issues in offspring, further disrupting population dynamics.

3. Impact on Feeding Habits: Ocean acidification also affects the behavior of marine predators. Some studies have shown that acidic water may alter the feeding habits of certain species, causing them to consume less food or switch to alternative food sources. This shift in diet can lead to imbalances within the ecosystem and disrupt food chains.

In conclusion, ocean acidification presents a significant threat to marine life, affecting their survival, reproduction, and feeding habits. The consequences of this phenomenon are far-reaching, potentially leading to a decline in biodiversity and disruption of marine ecosystems. Urgent action is necessary to mitigate the effects of ocean acidification and protect our oceans for future generations.

IELTS Scoring Standards:

- Task Response: 8.5/9 (The model answer effectively discusses the impact of ocean acidification on marine life, providing relevant examples and explanations.)
- Coherence and Cohesion: 9/9 (The model answer is logically structured, with clear transitions between ideas and well-organized paragraphs.)
- Lexical Resource: 8.5/9 (The model answer employs a range of vocabulary to convey complex ideas related to ocean acidification, although it could be slightly more diverse.)
- Grammatical Range and Accuracy: 9/9 (The model answer demonstrates advanced grammar, with few or no errors.)
- Spelling, Punctuation and Mechanics: 8.5/9 (Overall, the model answer is well-written, with only a minor punctuation error in the conclusion.)

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