permanent teeth eruption in children generally starts at the
age of
a. 6 months
b. 6 years
c. 2 years
. 12 years

12 years

Explanation:

liquid crystals are matters in a state which have properties between those of conventional liquids and those of solid crystals[1]. liquid crystal is partially ordered and anisotropic. in terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order.