Consider the evolution of protostomes (chapter 31) and deuterostomes (this chapter):
(1) compare adaptations in protostomes and deuterostomes for living on land.
(2) recall that changes in the expression patterns of tool-kit genes in arthropods such as insects enabled a dramatic diversification of their segmented appendages and bodies. design an experiment to test whether this concept applies to vertebrates.

Glomar challenger was a deep sea research and scientific drilling vessel for oceanography and marine geology studies. the drillship was designed by global marine inc

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.

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