A study was completed to the effect of the banded tetra on other plant and animal populations in its tropical stream environment the scientists looked at the population level of other species before and after they removed banded tetra What must be true about the banded tetra?
A. The banded tetra is a keystone species
B. The banded tetra is a foundation species
C. The banded tetra is a parasitic relationship with these other populations
D. The banded tetra is in a mutualistic relationship with these other populations

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explanation:

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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.