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

IELTS.WORK Free Online Writing Practice # 1710993033

Task: Discuss the impact of ocean acidification on marine life.

Model Answer:

The rapid increase in carbon dioxide emissions over recent decades has led to a significant rise in ocean acidity, a phenomenon known as ocean acidification. This essay will discuss the consequences of ocean acidification on marine life and assess the potential implications for ecosystems and biodiversity.

Firstly, ocean acidification directly affects the ability of marine organisms to form shells and skeletons from calcium carbonate, a process critical to many species' survival. For example, mollusks, such as oysters, clams, and snails, rely on calcium carbonate to build their protective shells. As ocean acidity increases, the solubility of this compound in seawater also rises, reducing the availability of raw materials for these organisms. Consequently, the populations of these species may decline, disrupting the food chain and affecting entire ecosystems.

Secondly, ocean acidification has been shown to impact marine life through behavioral changes. For instance, research indicates that fish exposed to higher levels of carbon dioxide exhibit altered swimming patterns, which can lead to increased vulnerability to predation. Additionally, coral reefs may experience reduced growth rates and a loss of resilience against disease and temperature stressors, threatening the survival of entire reef ecosystems.

Furthermore, ocean acidification has indirect consequences on marine life by exacerbating other environmental issues such as warming ocean temperatures. This combination of factors creates an inhospitable environment for many species, particularly those sensitive to temperature fluctuations and changes in pH levels. Over time, these cumulative effects may result in the collapse of certain ecosystems and significant declines in biodiversity.

In conclusion, ocean acidification presents a multifaceted threat to marine life, with direct impacts on the formation of calcium carbonate structures, behavioral alterations in fish populations, and indirect effects through enhanced vulnerability to environmental stressors. As these consequences become more pronounced over time, it is crucial that researchers and policymakers collaborate to mitigate this global problem and protect our oceans' biodiversity and ecosystems.

Overall score: Band 8.5

Task Response: Band 9 (The candidate demonstrates a highly cohesive and well-organized response, addressing the question in depth and presenting a clear and logical argument.)

Coherence and Cohesion: Band 9 (The response is consistently focused on the topic and effectively uses cohesive devices to create a coherent and logical progression of ideas.)

Lexical Resource: Band 8.5 (The candidate uses a wide range of vocabulary, often with varied sentence structures. However, some less common or less precise vocabulary may be observed.)

Grammar: Band 8.5 (The response is largely accurate in terms of grammar and syntax. Occasionally, minor errors in tense, verb agreement, or word form may occur, but they do not hinder the overall understanding of the text.)

Presentation of Ideas: Band 9 (The candidate presents ideas clearly and logically, with a strong emphasis on cause and effect relationships and appropriate use of evidence to support assertions.)

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