The writer wants to introduce the topic of electronegativity with a concrete, casually observable example from the natural world. Which choice best accomplishes this goal

B. How do water striders skim across the surfaces of ponds and lakes? Their hydrophobic legs are uniquely suited to this process, but the insects

Explanation:

Below are the options given:

A. NO CHANGE

B. How do water striders skim across the surfaces of ponds and lakes? Their hydrophobic legs are uniquely suited to this process, but the insects

C. How do our bodies break down the food we consume every day? While digestion would be impossible without enzymes and other proteins, these molecules

D. How does our DNA maintain a double helical structure? While the shape of this nucleic acid is the result of many complex properties, its structures

Option B is correct because it gives a concrete, casually observable example from the natural world and thereby accomplishes the goal. It explains the connection between surface tension and electronegativity.

Option B gives an example from the natural world - the water strider.

The water striders are a good example of insects that use the high surface tension of water and long, hydrophobic legs. This enables them to walk on water. Their legs are coated with a hydrophobic substance. The hydrophobic substance makes the legs to repel water molecules i.e it makes water unable to stick to their legs. This makes them to easily skim on water surfaces.

Electronegativity is a measure of the affinity between electrons and atoms.  

When an atom exhibits greater attraction for electrons, it is said to have very high electronegativity.

Electronegativity is an inherent quality that remains constant in all the atoms of an element. Fluorine is the chemical element with the highest electronegativity.  

In nature, the most important element which whose electronegative qualities (or whose ability to bind with other atoms) make it crucial for life is Oxygen.

When we inhale air, the Oxygen is used by our bodies to convert glucose to energy and Carbon Di-Oxide is released.

Cheers!

the correct answer is d

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