Read the passage below carefully, and then choose the best answer:
The Wonders of Wetlands
If you’re searching for scenic places or areas, visiting wetlands probably won’t be high on your list. Wetlands are areas of land that are often saturated with water and they are quite an eyesore. Although they might not look very pretty, they play an important part in keeping the environment clean and suitable for plant and animal life. With the exception of Antarctica, wetlands occur naturally on every continent. There are many different types of wetlands on the Earth, including bogs, swamps, and marshes. Along with rainforests, they are among the most diverse places on the Earth. In addition to naturally-occurring wetlands, humans are creating artificial ones for a number of purposes related to water management. One of the main benefits of wetlands is that they can prevent floods. They do so by storing water temporarily and then slowly releasing it over time. Wetlands operate similarly to a sponge. When it rains heavily and water levels rise, they absorb the excess water. This prevents runoff from entering streams and keeping them from overflowing. Then, when water levels become low in the future, they will release it. In many cases, wetlands offer a much more affordable solutions than dams. However, it’s important to note that wetlands, like dams, don’t eliminate all dangers from flooding. In cases of extremely heavy rainfall, wetlands can fill up and any additional water will start to run off. Wetlands can also play a part in water purification. Agricultural practices, urban runoff, and sewage waste are a major cause of water pollution. Wetlands contain plants and organisms that can reduce this pollution by filtering out unwanted substances such as chemicals, and decomposing matter, as well as sediment. Wetlands have additional benefits for the environment as well. They can help to feed nearby fish populations by releasing vegetative matter to rivers. Also, many amphibians use wetlands as breeding grounds because it provides places for foraging and the shallow water they require for reproduction. Some birds also use wetlands for migration, as they can settle in trees and then raid the wetland’s waters for fish when they’re hungry. Although wetlands may not look pretty, it’s clear that they are capable of doing the dirty work required to keep our planet clean and ensure that the circle of life remains unbroken.
1. What does the first paragraph suggest about wetlands?