They are natural disasters.
A gene is a hereditary trait in your body and also apart of your DNA not visible to the naked eye making up how you look
The correct answer is pollution.
The answer u r looking for is- D, Nuclear Envelope. Hope I’ve helped ;)
Depending on baseline oxygen saturation and the pathological condition of the lungs, risks associated with altitude exposure include profound hypoxemia, pulmonary hypertension, disordered ventilatory control, impaired respiratory muscle function, and sleep‐disordered breathing.
