Which of the following is not due to water’s surface tension? a. water coming out of a leaky faucet forms drops b. an insect walking across the surface of a pond c. water forming beads on the surface of a newly waxed car d. ice floating on the surface of water

The correct answer is option D, that is, ice floating on the water surface.  

The cohesive forces among the molecules of a liquid are accountable for the process called surface tension. Surface tension refers to the tension of the surface film of a liquid resulting due to the attraction of the particles in the surface layer by the bulk of the liquid that seems to reduce the surface area.  

The examples of surface tension are walking of small insects on water, floating of a needle, the surface tension of water offers the essential wall tension for the creation of bubbles with water, and surface tension is accountable for the shape of liquid droplets.  

The low density of ice makes it float at the liquid water surface, like ice cubes in a glass of water, or an iceberg. The lower density of water in its solid form is because of the way hydrogen bonds are aligned as it freezes, the water molecules are pushed further far away in comparison to the liquid water.  

The correct answers are postzygotic isolation and allopatric isolation.

Explanation:

A kind of reproductive isolation that inhibits species from mating with each other as a consequence of the variations, which has created between them when they are distinguished by physical boundary is known as postzygotic isolation.  

The mode of speciation, which take place when a biological population of similar species becomes separated from each other to an extent that it interferes with genetic exchange is known as allopatric speciation. It generally takes place as a consequence of variation in the environment.