Awildlife researcher weighed all the raccoons that were trapped in suburban neighborhoods before they were released back
into the wild. the researcher used this data to conclude that the raccoons in the state were getting heavier.
what error did the researcher make?
the sample is based because it only weighed raccoons that were trapped in suburban neighborhoods.
the researcher should not have released the raccoons back into the wild.
the sample is biased because the averages of the weights were not calculated
the researcher should have weighed other animals besides raccoons.

The sample is biased because it only weighed Raccoons that were trapped in Sub urban neighbourhoods.

Explanation:

The researcher was experimenting with Raccoons which were trapped in suburban neighbourhoods. It weighed each trapped Raccoons and merely concluded that all the Raccoons in the state are heavier. This is a big error committed by the researcher because, the physical factor of living organism doesn't remains same in all the place.

It varies according to the situation and the external environment in which the organism is surviving. Merely weighing some trapped Raccoons from one region and deriving conclusion that all the raccoons are heavier in the state is scientifically as well as practically is not acceptable.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.