I need help does KOH absorb CO2

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added