Air is then breathed into the windpipe and lungs, while the mucus is swallowed (figure 3). Other. Other interesting structures associated with the nasal and sinus tract: Tear duct (called the nasolacrimal duct): drains tears from the inside corner of the eye into the nasal cavity (figure 1).
Human activity is the main cause of soil degradation. Agriculture plays a large part in soil degradation, especially clearing, irrigation, the spreading of chemical fertilizer â¦ s and pesticides, overgrazing and even the passage of heavy farming equipment. Tillage and the clearing and deforestation of large plots of land also lead to soil degradation.
Quick Answer. Many human activities cause pollution, habitat destruction and climate change, all of which are destructive to ecosystems. According to the World Wildlife Fund, the use of pesticides and fertilizers on farms has increased 26-fold over the last 50 years, which has caused increased damage to streams, rivers, lakes and the worldâs oceans.