Final answer:
Mangroves contribute to coastal protection by acting as a natural barrier, while wetlands alterations can cause severe damage. This falls under the subject of Biology in a High School level.
Step-by-step explanation:
The subject of this question is Biology and it is suitable for High School level.Mangroves, which are trees that flourish in wetlands, contribute to coastal protection. They act as a natural barrier, protecting the coast from destructive storms and tsunamis. The loss or alteration of wetlands, on the other hand, leads to severe damage in those areas.