The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
Answer:d.ethnic cleansing
Explanation:
Ethnic cleansing can be defined as the foreceful removal of unwanted ethnic comnunity or racial group from a given territory by more powerful ethnic group. This is done with an intent of making the nation or region ethnically homogeneous. This is done by forced migration, homicides and genocidal rapes.
The given situation of Bosnia is an example of ethnic cleansing. The Muslim community is the ethnically inferior group which is being treated badly so that the community can be irradiacted from Bosnia.
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As a result, the climatological community has defined four types of drought: 1) meteorological drought, 2) hydrological drought, 3) agricultural drought, and 4) socioeconomic drought. Meteorological drought happens when dry weather patterns dominate an area. ... Agricultural drought happens when crops become affected.
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Answer:
A human settlement is a place where people live. Settlement patterns describe the ways in which villages, towns, cities and First Nation reserves are distributed, as well as the factors that influence this arrangement.
