UV rays reacting with the O2 molecules
I might be wrong a little but
Hope the helps :)
Plants use their stomata to take in Carbon dioxide and take out oxygen during photosynthesis. It's how they "breathe" if that makes it more understandable.
Answer:
The pollution present in the air is primarily categorized as chemical, physical and biological sources, apart from this it is also categorized as natural and anthropogenic sources of pollution. The anthropogenic sources of pollution are caused mainly due to human activities, that is, these are the man-made sources of pollution.
The anthropogenic pollution arises due to deforestation, burning of fossil fuels, discharges originating from the industries, fertilizers, and pesticides, etc. The prime anthropogenic pollutants present in the air originate due to the combustion of fossil fuels. In the United States, the three prime anthropogenic sources of gaseous air pollutants are transportation, industry, and production of energy.
The right option is; to identify the 3 billion genes that comprise the human genome
The Genome Project (HGP) is the world’s largest international scientific research project that has the goal of mapping the nucleotides (more than 3 billion), that makes up the whole human genome, and recognizing the structure and functions of the entire genes. Several organizations that contributed to the project include; National Human Genome Research Institute (NHGRI) of Health, international partners in France, United Kingdom, the U.S. Department of Energy, and many universities and laboratories in the United States.
