LOL. "brave new world" was written in 1931. In 2018 there is no evidence that you can retain knowledge when you're sleeping if someone whispers in your ears", its a myth !
Answer: Concrete Operational Stage
Explanation:
Conservation is the concept of things staying the same even though other elements change, and this becomes apparent when a child is anywhere from 7-11 years old which puts them in the concrete operational stage.
Answer:
70-85%
Explanation:
Inoculation is basically developing herd immunity in a given population so that there is no more spread of the virus and the pandemic is prevented.
It is generally believed that if 75-80% people are inoculated then epidemic can be prevented.