Golden Rice 2 produces 23 times more carotenoids by combining two beta-carotene biosynthesis genes from other species (maize and bacteria). It was made in 2005 and intended to produce fortified food to be grown and consumed in areas with a shortage of dietary vitamin A. This is an example of ...

Rice is a staple food crop for over half of the world's population, providing 30–72% of the energy intake for people in Asian countries, and becoming an effective crop for targeting vitamin deficiencies.

Explanation:

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.