It is false scientist don't need to repeat an experiment
Recessive because If one of your parents has it, you have a small chance of getting it too.
For the first question the answer is D
For the second question the answer is B
The answer is cohesion. The high surface tension helps the paper clip (with much higher density) float on water. The property of a liquid that allows it to resist an external force, due to cohesive nature of its molecules. Cohesion refers to the attraction of molecules for molecules of the same kind. Water molecules have strong cohesive forces due to their ability to form hydrogen bond with each other.
