If t is years, and n is months, the answer would be B) 12, because there are 12 months in a year.
According to the article, an estuary is a coastal body of water where the mouth of a river meets the sea.
<h3>What are the parts of the ecosystem found in estuaries?</h3>
It is the aquatic biome where a high-flow watercourse empties into the ocean, generally, it is found in areas with high-amplitude tides.
As to the living parts of the ecosystem found in estuaries, a great variety of fish and molluscs are concentrated.
On the other hand, the nonliving things of this ecosystem are low in salinity due to the fact that the sea water, when it meets the river water, loses a large percentage of it, it also offers an ideal temperature for the proliferation of life.
Therefore, we can conclude that according to the article, an estuary is a coastal body of water where the mouth of a river meets the sea.
Learn more about ecosystem found in estuaries here: brainly.com/question/2865934
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15.5 I believe is the answer, if not then its 25.25
