There is no specific answer to the meaning of life. The meaning of life, or the answer to the question pertains to the significance of living or existence in general. The question has many answers depending on who you ask.
My answer:
The meaning of life is overcoming struggles and triumph effortlessly, make strong bonds with people and make differences in their life, trying new things and shooting your shot until that ball goes through the hoop, and lastly doing what you love. Doing what makes you happy and smile!
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I think that having an extra chromosome 21 is tolerable to the point that someone with this condition can survive to maturity because it does not replicate.
There should only be a pair of chromosome 21. In the event that there are 3 chromosome 21, the person that has this extra chromosome has Down syndrome. Changes in the number and structure of this chromosome may result to delayed development, intellectual disability, but not immediate death.
A substance that enters into a Chemical reaction is called an reactant.
(noun) a division or contrast between two things that are or are represented as being opposed or entirely different.
(botany) repeated branching into two equal parts