By birth? i think? do you mean like how did they get in a certain caste? because then it would be by birth. but if you mean like what were the castes, i forget.
The resources that made Kush a valuable trading partner were gold, copper, ebony, and ivory.
It was the "Chinese Exclusion Act" of 1882 that excluded an entire ethnic group from immigrating to the United States, partly because of economic fears but also because of blatant racism.
<u>Answer:</u>
<em>Oxygen levels would be higher, but carbon dioxide levels would be the same.
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<u>Explanation:</u>
The procedure by which living things convert oxygen and glucose to water and carbon, accordingly yielding vitality is called photosynthesis. It does not require the nearness of daylight and is continually happening in living life forms. Cell breath occurs in the mitochondria of cells.
Through these procedures, plants get the carbon dioxide they need, and living life forms get the oxygen they need. They are additionally crucial to the vitality trade that living things need to endure.
