Human vulnerability to toxins is varied; however, the main influences determining the effects of toxic substances on different individuals are genetics, socioeconomic status, general health, and .

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

c. establishing proper sleep hygiene

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.