Provitamin A, also known as beta-carotene, is necessary for human health. People who do not make this substance suffer serious medical problems. Which application of genetic technology has been the MOST promising for treating people who suffer from a deficiency of provitamin A?

The application of genetic engineering called golden rice

Explanation:

Golden Rice is a genetically engineered biofortified crop designed by biosynthesizing beta carotene in the edible part of rice. Golden rice was created by transforming rice with two beta-carotene biosynthesis genes: psy (phytoene synthase) from daffodil ('Narcissus pseudonarcissus') crtI (phytoene desaturase) from the soil bacterium Erwinia uredovora.

Golden rice was genetically modified to provide beta-carotene, which is converted into vitamin A in the body, which is an essential nutrient that white rice lacks.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.