Read the text and answer the question!

 

Mangrove

    A mangrove is a tropical marine tree. Mangroves have special aerial roots and salt-filtering tap roots which enable them to thrive in brackish water. Brackish water is salty but not as salty as sea water. Mangrove trees are commonly planted and found in coastal areas. Mangroves can serve as wall of protection for natural disaster in coastal area like tsunami. According to BBC News, healthy mangrove forests had helped save lives in Asia disaster tsunami and people tended to respect these natural barriers even more, especially after the tsunami.

    There are several species of mangrove tree found all over the world. Some prefer more salinity, while others like to be very-close to a large fresh water source such as river. Some prefer areas that are sheltered from waves. Some species have their roots covered with sea water every day during high tide. Other species grow on dry land but are still part of the ecosystem. The times of India reported that are species of mangrove had been found and was also known as the looking-glass tree, probably because the leaves are silver-coated.

    Mangroves need to keep their trunk and leave above the surface of the water. Yet they also need to be firmly attached to the ground so they are not moved by waves. Any part of root that appears above the water transfer oxygen to the plant under water surface. As the soil begin build up, these roots produce additional roots that become embedded in the soil.

The tense mostly used in the text is ...?

Please write the sentence from the text.