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

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

Question: In what ways does ocean acidification affect marine ecosystems, and what consequences might these changes have for human societies?

Model Answer:

In recent years, the increasing levels of carbon dioxide in the atmosphere have led to a rise in ocean acidity, commonly referred to as ocean acidification. This phenomenon has far-reaching implications for marine life, as well as potential consequences for human societies. In this essay, I will discuss the impact of ocean acidification on marine ecosystems and examine its effects on various species.

Firstly, ocean acidification directly affects the shell-building capacity of organisms such as mollusks, crustaceans, and corals. As the acidity of seawater increases, it becomes more difficult for these creatures to build strong and durable shells or exoskeletons from calcium carbonate. This can lead to a decline in the population of these species and disrupt the balance of marine ecosystems.

Secondly, ocean acidification can also impact the behavior and physiology of marine organisms. For instance, studies have shown that some fish species become more aggressive and prone to predation when exposed to higher levels of acidity. Additionally, it has been observed that certain species of plankton, which form the basis of the marine food chain, experience reduced reproductive success due to altered sensory abilities.

Lastly, the consequences of ocean acidification extend beyond the realm of marine ecosystems themselves. As the biodiversity of oceans decreases, so too does the productivity and resilience of these ecosystems. This can have significant impacts on human societies that rely on marine resources for food, income, and cultural practices. For example, a decline in fish populations due to ocean acidification could lead to job losses in the fishing industry and reduced food security for coastal communities.

In conclusion, ocean acidification is an important issue with far-reaching consequences for marine life and human societies alike. The direct impact on shell-building organisms, as well as changes in behavior and physiology of various species, disrupt the balance of marine ecosystems. Moreover, these changes have significant implications for the productivity and resilience of these systems, which are crucial for providing food, income, and cultural practices to human societies.

Score: Band 9

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