InnocentSoul
04.09.2019 •
Biology
Discussion topic
chemical energy sources are often portable and provide large amounts of energy. fossil fuels are one kind of chemical energy source. most of the energy we use in the united states is generated by the combustion of fossil fuels. however, fossil fuel combustion adds greenhouse gases to the atmosphere, mostly co2. one measure of the total amount of greenhouse gases that are emitted into the atmosphere each year is called a carbon footprint. read this article to compare the carbon footprint of an average person in the united states to an average person around the
world. knowing that greenhouse gases are
contributing to climate change, how can we
reduce our carbon footprint, particularly in the
united states? could hydrogen fuel replace
fossil fuels in the future? why or why not? should the size of a person's carbon footprint be limited by law? why or why not?
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Ответ:
Natural selection and speciation: 'Ecological speciation'. ... Natural selection is generally recognized as a central mechanism of evolutionary change within species. Thus, natural selection plays a major role in generating the array of phenotypic and genetic diversity observed in nature.