The answer is negative controls. These are groups where no phenomenon is probable. They ensure that there is no effect when there should be no effect. Where there are only two possible outcomes, e.g. positive or negative, if the treatment group and the negative control both produce a negative result, it can be concluded that the treatment had no effect. If the negative control group and the treatment group both yield a positive result, it can be inferred that a puzzling variable is involved in the occurrence under study, and the positive results are not only due to the treatment. In other examples, outcomes might be measured as lengths, times, percentages, and so forth.
The answer is :they passed on their genetic material to new cells when they reproduced.
Explanation : Well when cells undergo division , they pass on their genetic material , so that's the same way that bacteria passed and still passes it's genetic material by the process of rep
roduction.
Hope this helps :)
Answer:
The answer is "form only at boundaries between two continental plates." :)
Louder, because the sound would have a stronger pitch for the ear it is closer to
