Which of the following fossil discoveries best demonstrates a change in the earth's climate? a. scientists find a large amount of fossils of tropical plants and animals in a desert. b. scientists discover fossils of straight teeth buried below fossils of curved teeth. c. scientists discover a large amount of fossils of marine life near the shore. d. scientists find an area that contains a variety of plant fossils but no animal fossils.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.