The answer is letter
A.
<span>
Spinach is also known
as the super food because of its high concentrations of various vitamins and
minerals. It is also contains powerful antioxidants like beta-carotene, lutein,
and zeaxanthin that are responsible for immune system protection. The best way
to prepare spinach is to boil it for about a minute. This is to help reduce concentrations
of oxalic acids while, minimizing the loss of its major nutrients and flavors.
It is known to be the super food because it has nutritional contents that can
prevent cancer.</span>
Gen. David L. Goldfein is Chief of Staff of the U.S. Air Force, Washington, D.C.
Answer: 2)
A mnemonic device
Explanation: A mnemonic is a tool or memory aid that helps people to remember or memorize things easily. It helps you to remember an idea or phrase with a pattern of letters, numbers, or relatable associations. Mnemonic devices may include special rhymes and poems, acronyms, images, songs, outlines, and other tools. In the question Luke makes up a sentence using the first letter from each base as the first letters for his words, repeating to himself to help him remember more easily the bases of DNA. In other words Luke formed mnemonics using the first letters of the DNA bases to remember them easily.