Nepal still behind a lot of things and it’s very new to things
A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout a given sample (or multiple samples of different proportion). ... Conversely, a heterogeneous mixture does not have uniform in composition, but proportions of its components vary throughout the sample.
Wikipedia
This is called the critical period.
The critical period itself is a stage of the development in the life of a human being in which is said that skills are most easily and most readily learned and acquired. This period usually varies for different things like binocular vision and language, but it is said that after the critical period the skills are acquired with much difficulty if they are to be acquired at all.
