Carbon dioxide in the tissues is produced as the result of oxidation of glucose...
This carbon dioxide in process of respiration diffuse out of the tissues in form of molecular carbon dioxide and join with water forming carbonic acid ...
In lungs again carbon dioxide is separated and released out of the body...
Answer:
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Life doesn't really form in soil water or air, rather it is introduced through other organisms that could for example drink water. after the organism did so, it would leave bacteria in it whitch would start to multiply.
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
The pericardial cavity separates the parietal and visceral pericardium