When it comes to IQ, it's a case of 'Use it or lose it'". What does "Use it or lose it" mean?

The answer is below

Explanation:

The term "Use it or lose it" concerning the Intelligent Quotient implies that when individuals don't utilize, and stretch their brain or intelligence capacities, in the longer run, as individuals age or grow older, the brain or Intelligent Quotient will not deliver high or maximum performance.

In other words, the more individuals use their mental capacity, the more likely one is to retain that mental capacity, in the long run, otherwise, one loses it.

the right ones are in bold.

daintly refers to the fact she was reaching for what she ate, not necessarily what she is like.

greatest charm as in she possessed (=had) the greatest charm.

pleasant (her demeanor)

speaking (of her sensibility)

dead refers to the hypothetical mouse.

bleeding refers to the hypothetical mouse.

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.