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.
Answer:
• Water molecules attracted to other objects (because of their polarity and hydrogen bonds)
Explanation:
Answer:
sandston takes many of thousand if years to form
Explanation:
<span>A seatbelt should be fastened so as to run diagonally across the chest and to fit low and tight across the waist. This ensures that, during the rapid deceleration experienced during a crash, the seatbelt will perform the intended function, that is, to keep the passenger in place within the vehicle.</span>
<span>Example of Trisomy 21 detected</span>... <span>the presence , which is found in Down syndrome, is calledtrisomy 21.</span> ... <span>Of these, Trisomy 21 and Trisomy 18 are the most common.</span> ... <span>XXX (Triple X syndrome); XXY (Klinefelter syndrome); XYY</span> ... <span>Turner syndrome (XO).
so i think all are right</span>
