B cuz they can appear at any time
I would say D is NOT one of the reasons why life is found only on Earth
First, let's check whether all the statements are correct?
No, one statement is false:
B. China has recognized Taiwan's independence
In fact, China continues to treat Taiwan as its province. Since the statement is not true, it can't also be a reason for something: this is the correct answer.
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Answer:
The marshes are defined as the type of wetland where the water covers the ground surface for a long period of time. Here, the trees are absent and are mostly dominated by the grasses and other small herbivore plants. They are commonly formed in delta type of environment where the rivers adds water into the seas. It forms an isolated and distinct ecosystem.
The marshes in nature, behaves like a filtration process as the vegetation that are present in marshes takes up more amount of nutrients for their growth and expansion. But, if it does not use up these excess nutrients then it cause water pollution comprising of nitrogen and phosphorous.
They also plays an important role in the reduction of damages that are caused by a flood.
The marshes are sometimes seasonal and it occurs when the height of the river level is relatively high, and it floods the grassland areas.
The marshes are of three types-
(1) Tidal salt marshes
(2) Tidal freshwater marshes
(3) Inland freshwater marshes.
the nuclear stockpile of the United States peaked in 1967
