Is a method of taking drugs through the skin, nasal cavity, lining of the mouth or rectum, or eyes.

absorbtion im pretty sure

The answer is abortion.

Explanation:

Retention is characterized as the procedure when one thing turns out to be a piece of something else, or the procedure of something splashing, either actually or allegorically. A case of retention is drenching up spilled drain with a paper towel. Retention, when all is said in done detect, is the demonstration or procedure of retaining or acclimatizing. In science, retention relates to the procedure in which a substance penetrates another, as in a fluid saturating, or consumed by, a strong.

this isnt

c) troops march forward in close formation against newer, more accurate weapons