36. According to the passage, why were the remains of organisms trapped in swamps betterpreserved for the fossil record than those that were not?
(A) The swamp environment reduced the amount of bacterial decay.
(B) Swamp waters contained higher amounts of materials such as calcium carbonate.
(C) There were fewer sediments in swamps than in other bodies of water.
(D) Swamp vegetation accelerated the decomposition of organisms.