<span>DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.</span>
The primary and most significant greenhouse gas emitted from human activities is carbon dioxide. Burning of fossil fuels is the major cause of increased carbon dioxide emission.The burning of coal, oil, and natural gas is an important energy source to produce electricity.
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1: sustainability is an avoidance of the depletion of natural resources in order to maintain an ecological balance.
2: Sustainability means meeting our own needs without compromising the ability of future generations to meet their own needs.
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Answer: When you study environmental science, you commit to learning of accomplish important tasks for our Earth and our human population.
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