According to the question, option b rhea.
The largest South American bird, rheas are flightless and resemble ostriches.
What is the most common organism in grasslands?
A temperate grassland is a biome where grass is the dominant plant. Because of the lack of moisture in this environment, trees and shrubs cannot grow in temperate grasslands and the main plants found are grasses and flowers.
Thus, option "B" is correct.
To learn more about grasslands click here:
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