The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen
A proper adjective is an an adjective derived from a proper noun that is also typically capitalized. (Proper nouns are the origin of proper adjectives.)
In this case, if Britain is a proper noun, then British is the proper adjective. So the answer to your question should be <u><em>British.</em></u>
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The united state has a better living condition based on it's Capital GDP compared to that of Cuba, United state is considered to be a developed country unlike Cuba who is under developing.