Which type of coastal defences is meant to keep sweater out of a place? Which coastal defences makes waves break earlier, out at sea? ​

Groynes, Sea wall, Revetments, Breakwaters and Gabions.

Explanation:

Groynes, Sea wall, Revetments, Breakwaters and Gabions are the types of coastal defenses that keep sea water out of a place and helps in the protection of the coastal area. All these coastal defenses such as Groynes, Sea wall, Revetments, Breakwaters and Gabions etc helps in the breaking of waves that is coming from the ocean to the coast.

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.