People believe that the Earth has "no capacity." I was researching for you question and scientist believe it's around 9 billion and 10 billion. I then look around more and they said about 10 billion... then we would be having food problems. So C.
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Allelic exclusion is defined as a process in which only one allelic gene is expressed and other allele remains silenced.
Allelic exclusion plays important role for cell surface receptors in genes and in immune cells like B lymphocytes. The allelic exclusion controls binding site of B cells and allows only one type of binding site expressed in each B cell as binding site of an antibody is decided by the combination of a particular heavy and light chain.
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The force that pulls planets towards the Sun is called gravity.
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In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data. In scientific reasoning, a hypothesis is constructed before any applicable research has been done.