Mary discovered that the cell membrane of a bacteria act like a fence because it keeps some things in and other things out
a. observation
b. analogy
c. inference

The correct answer will be option-B.

Explanation:

The analogy is a concept of comparing the two completely different things based on the similarity between these things and concepts. The concept of analogy is used to explain or make things clear while explaining a thing.

In the given question, since the membrane of the bacteria is compared to the fence of a garden which is two different things, therefore, the analogy will be the correct answer.

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.