What are the functions of meristematic tissue?

A tree grows in height at the rate of 0.5 m per year. At the age of 30 years, a nail is introduced into the trunk, at a point 1 m above the soil surface. After three years, the position of the nail will be :

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$