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Life is the characteristic state of organisms and individual cells. Properties common to the known organisms found on Earth (plants, animals, fungi, protists, archaea and bacteria) are that they are carbon-and-water-based, are cellular with complex organization, undergo metabolism, possess a capacity to grow, respond to stimuli, reproduce and, through natural selection, adapt in succeeding generations. An entity with the above properties is considered to be an organism. However, not every definition of life considers all of these properties to be essential. For example, the capacity for descent with modification is often taken as the only essential property of life. This definition notably includes viruses, which do not qualify under narrower definitions as they are acellular and do not metabolise. Broader definitions of life may also include theoretical non-carbon-based life and other alternative biology. Although it cannot be pinpointed exactly, evidence suggests that life on Eart...

Today, air pollution has become a distressing reality in most parts of the world. Air pollution is a chemical, physical (e.g. particulate matter), or biological agent that modifies the natural characteristics of the atmosphere. The atmosphere is a complex, dynamic natural gaseous system that is essential to support life on planet earth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the earth's ecosystems. There are almost as many types of air pollution as there are potential solutions. No matter what type of air purification system you're looking for, you should know that there is not one product on the market today that can solve every problem. Plants and trees, nature’s natural mechanism to purify the air that we breathe, have been successfully doing the job of air-purification for us for the last thousands of years. Our symbiotic relationship with them ensures that they cleanse our air of carbon dioxide...