The correct answer is A. A small pond has about 1,300 organism and 26 different species living in it.
Explanation:
In biology, the word biodiversity refers to the existence of a wide variety of different organisms or lifeforms including plants and animals species in a specific habitat or all the around the world. This means, if a habitat or ecosystem is biodiverse is because in it multiple species and organisms can be found. This biodiversity varies according to weather and other conditions and can be negatively reduced through mass extinctions in which multiple organisms and species are killed and therefore biodiversity is reduced. Considering this, the statement that best exemplifies the biodiversity of a ecosystem is "A small pond has about 1,300 organism and 26 different species living in it" because in this example the existence of multiple organisms (1,300) of different species (26) in the same ecosystem (pond) is described which is consistent with the definition of the word biodiversity.
