Why is it possible to float a small paperclip very carefully on top of water? (2 points)

hydrogen bonds between water molecules create surface tension.

unpaired electrons on water molecules at the surface create surface tension.

only water close to freezing and denser than usual will have enough surface tension.

covalent bonds between the hydrogen and oxygen of water molecules create surface tension.

The correct answer will be option-Hydrogen bonds between water molecules create surface tension.

Explanation:

The water is made up of water molecules which are bonded to each other thorough hydrogen bonds but at the surface of the water , the water molecules do not have the extra molecules to bind.  

This causes more tension between water molecules and cause large cohesion between the water molecules at the surface due to which it forms an invisible thin film at the surface. It is known as surface tension.

The surface tension causes the paper clip to float on water and therefore selected option is the correct answer.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".