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IELTS Free Online Writing Practice - Write an essay discussing the impact of ocean acidification on marine life.

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Task: Write an essay discussing the impact of ocean acidification on marine life.

Here's a model answer for this writing topic:

Title: The Devastating Effects of Ocean Acidification on Marine Life

In recent years, scientists have observed a significant increase in the acidity levels of oceans worldwide. This phenomenon, known as ocean acidification, is primarily caused by the absorption of carbon dioxide from the atmosphere. As a result, marine life has been significantly impacted due to changes in their habitat and food chain. In this essay, I will discuss the consequences of ocean acidification on various marine species and ecosystems, as well as the potential long-term effects on global biodiversity.

One of the most apparent impacts of ocean acidification is its effect on coral reefs. Corals are sensitive to changes in water chemistry, and the increased acidity levels make it difficult for them to form calcium carbonate, a key component of their exoskeletons. As a result, many coral species have experienced severe bleaching events, leading to weakened structures and a decline in overall reef health. This not only threatens the survival of numerous marine species that depend on these ecosystems for shelter and food but also negatively impacts tourism and coastal communities that rely on the economic benefits of healthy coral reefs.

Fish populations are another significant concern in the context of ocean acidification. Many fish species, particularly those with calcium carbonate shells or skeletons, such as mollusks, have experienced decreased survival rates due to the difficulty in forming strong shells. Moreover, ocean acidification has been shown to affect the behavior and sensory abilities of certain fish species, making them more susceptible to predation and environmental stressors. Consequently, changes in fish population dynamics can have far-reaching consequences for the entire marine food chain and ecosystem stability.

Additionally, acidification also poses a threat to marine life through its impact on plankton populations. Plankton are microscopic organisms that play a vital role in the marine food chain as they serve as a primary food source for various marine species. Ocean acidification has been found to alter the behavior and distribution of certain plankton species, which can disrupt the delicate balance of marine ecosystems. This can ultimately lead to a decline in overall biodiversity, affecting not only fish populations but also other marine creatures that rely on these food chains.

In conclusion, ocean acidification is an urgent issue that has far-reaching consequences for marine life and global biodiversity. The effects of increased acidity levels have been observed in various species, including corals, fish, and plankton, which are all integral components of marine ecosystems. As these changes continue to unfold, it becomes increasingly crucial to address the root causes of ocean acidification, such as reducing greenhouse gas emissions, in order to mitigate its devastating impact on our planet's rich and diverse underwater worlds.

Rating: Band 9 (Expert User): The essay is well-organized, coherent, and presents a comprehensive analysis of the topic. It effectively discusses the various impacts of ocean acidification on marine life, including coral reefs, fish populations, and plankton. Additionally, it provides a compelling argument for addressing the root causes of this environmental issue to protect global biodiversity.

Overall, the essay demonstrates a strong understanding of the topic and is deserving of a high Band 9 score.

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