Multiple Choice
Aclosed circulatory system is one in which
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A. blood spreads freely throughout all of the body's tissues and organs.
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B. blood flows through a system of blood vessels throughout the body,
Cblood travels through blood vessels into cavities called sinuses.
D. blood is pumped through a system of blood vessels and air sacs.

The right answer is B).

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.