Recurrent mutations reduce the mean fitness for a population, this reduction depends on the rahter than the fitness effects of the deleterious mutations, a result that was termed
a. fisher's fundamental theorem
b. population the haldane-muller principle
c. the haldane-muller principle
d. mutation the haldane-muller principle
e. mutation fisher's fundamental theorem
f. population fisher's fundamental theorem

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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