Counting the yearly layers can date them. The oxygen in the water molecules also holds a key to past climate. Scientists are able to use the oxygen atoms in the glacial ice as a proxy for air temperature above the glacier.
Leukotrienes are involved in asthmatic and allergic reactions and act to sustain inflammatory reactions. In asthma, Lekotrienes causes.: i)airflow obstruction ii)increased secretion of mucus iii)mucosal accumulation iv)bronchoconstriction v)infiltration of inflammatory cells in the airway wall.