The class act as a switchboard between the view layer and the domain layer.

The control class acts as a switchboard between the view layer and the domain layer.

Explanation:

As the name suggests, the control class is responsible for performing the control actions. The view layer defines the entities and attributes which have to be viewed and their structural organization.

The domain layer consists of all the entities, attributes, and relations in the data. The control class controls the flow of information between the two layers and performs the operations of filtering and selecting the content to be displayed.  

answers

a. nitrogen (n)

d. oxygen (o)

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