To remember the four bases found in dna—thymine, guanine, adenine, and cytosine—luke makes up a sentence using the first letter from each base as the first letters for his words, repeating to himself, "the girl ate cookies." which of the following did luke use in this scenario?
(a)-the method of loci
(b)-a mnemonic device
(c)-chunking
(d)-rhyming

(b) - A mnemonic device

Explanation:

A mnemonic device -

It is a technique used by a person to improve or faster the process of a learning .

This can be done by using some codes or tricks to make the concept or words easy and interesting , and can be easy learned .

hence ,

in the question , Luke used the mnemonic to learn the four bases of DNA quickly and efficiently .

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c