A identifies the content and purpose of the visual, along with whatever label and number you're using to refer to the visual.

Title

Explanation: Title is basically considered as the "heading" or the "topic" that is used for giving the hint about the content or visual. In context with the visual ,which is the piece of display where title determines about the reason of visual and also hints about the content .It also gives the reference number that a person assign to the visual.

answers

a. nitrogen (n)

d. oxygen (o)

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