While most of the snakes living in or near the water are adapted to a fresh water environment, some, like the cottonmouth and mangrove salt marsh snake, can survive in the mangrove swamps and salt water marshes.
(most of the snakes; living; L:in or near the water) (some; can survive; L:in the mangrove swamps and salt water marshes)
most of the snakes some
living can survive
L:in or near the water
L:in the mangrove swamps and salt water marshes