Answer: On March 3, 1887, Anne Sullivan begins teaching six-year-old Helen Keller, who lost her sight and hearing after a severe illness at the age of 19 months.
The correct answer is that they 'are not valid'. If the experiment is biased, it entails that it is not objective. For a experiment, and its results, to be valid, it had to be carried out objectively and taking into account all factors.
It is possible that the results disprove a hypothesis, but to be certain it is necessary to see which was the original objective of the study, as it might also prove to some extent a hypothesis, which is probably also biased.
Answer:
the anwser is the cat ate the rat
Explanation:
ate
There are more than 2 types , but the answer for this question is Person vs. person & Person vs. Nature
The characters Physical descriptions.