Answer: It is important to conduct many different experiments and estimates in a project for having as much statistic data as possible, because it is necessary to show proof on whichever project you are into. In order to avoid confusion, it's also possible to <u>organize data in Excel sheets/tables so it can be visually easier to interpretate</u>. <u>Gut instinct isn't enough to prove something wrong or righ</u>t, and <u>few data means higher probability of things going in ways other than the expected</u>.
Answer:
2)
Explanation:
The positive control is the treatment where bacteria grew without lead. Since positive control indicates the presence of bacteria in the experimental conditions, it is possible to confirm that they only death in presence of this metal. However, it is important to note that it is imperative to repeat this experiment three times and also to include a negative control in order to confirm these results.
A controlled variable is not changed throughout an experiment. It is there so that the other variables being tested on can be better understood.
Mutation may occur if both copies of DNA molecules do not have the exact same sequence of nucleotides as the original DNA molecule. Mutation can also lead to further problems, in the future.
The correct option is C, ROUND WORM is a pseudoceolomate. Pseudoceolomate have a body cavity surrounding the gut but the gut itself is not surrounded by mesoderm; generally, their body cavity are lined by mesoderm derived tissue on one side and endoderm derived tissue on the other side. Other examples of pseudoceolomate are hook worm, hair worm, rotifers and pinworm. They are mostly parasitic in nature.
