Answer:
Prokaryotic cells are used to perform specific functions such as respiration and digestion of waste.
Explanation:
A good advancement would be a portable radio. They have made life easier for people who are walking/hiking and are looking for something such as the weather for the night or the score for a sports game.
The focusing of conscious awareness on a particular stimulus, as in the cocktail party effect (ability to attend selectively to only one voice among many). thats the answer
