While fishing,a biology student makes the following observations:
1)Water spiders appear to be able walk on the surface of the water.
2)Flat rocks may be made to skip across the water.

Question

Quizplus · Accepted Answer

Observation 1 shows that water spiders can walk on the surface of water, which can only be possible due to the cohesive nature of water molecules. Cohesion refers to the attraction between water molecules. This attraction allows the molecules to stick together and form a surface tension strong enough to support the weight of the water spider. This is described by choice C, which states that water molecules are cohesive.
Observation 2 shows that flat rocks can be made to skip across the water. This happens because the surface tension created by the cohesive nature of water molecules is strong enough to support the weight of the rock long enough for it to skip. This cohesion is further supported by the fact that water molecules are often associated with each other via hydrogen bonds, as stated in choice D. Thus, the best choice is E, which includes both choices C and D.

While Fishing,a Biology Student Makes the Following Observations