Answer:
Hydrogen and helium.
Explanation: I hope this helps
Answer:
Ocean acidification is often called global warming's evil twin. ... As humans burn more and more fossil fuels, the concentration of carbon dioxide in our atmosphere continues to rise, driving climate change and making both air and sea temperatures hotter and hotter.
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D. the population decreased by 0.5% due to the struggling auto industry and high unemployment rate</span>
According to the U.N. FAO, <span>51.0% or about 2,605,000 ha of Costa Rica is forested, according to FAO. Of this 23.9% ( 623,000 ) is classified as primary forest, the most biodiverse and carbon-dense form of forest. Costa Rica had 241,000 ha of planted forest. </span>