Which of the following describes a competitive relationship between two organisms? A.
A deer tick lives on a white-tailed deer and drinks the blood of the deer.
B.
An owl and a snake in the same ecosystem both eat mice as a major food source.
C.
An oxpecker sits on the back of a zebra to pick small parasites off the zebra's back.
D.
A bluebird swoops down from the air to catch a grasshopper and eats it.

B. An owl and a snake in the same ecosystem both eat mice as a major food source.

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.