Answer: The correct answer is-
Natural selection.
Explanation:
Natural selection is an evolutionary theory that was given by Charles's Darwin. According to this theory, organisms that possess a beneficial allele (a gene variant) for their survival or that are capable of adapting themselves in changing environmental conditions, will survive and produce large number of offsprings through reproduction.
Thus, it means that if an organism becomes adapted to its environment, it will survive.
Therefore, Natural selection is the right answer.
For the cause of the gas in our air
Answer:
Our bodies use water in all the cells, organs, and tissues, to help regulate body temperature and maintain other bodily functions. Because our bodies lose water through breathing, sweating, and digestion, it's crucial to rehydrate and replace water by drinking fluids and eating foods that contain water.
EXPLAINATION:
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The answer is straight chain, branched chain and ring. The straight chain is called pentene. Branched chain is the hexane. While the ring is Vanillin. Pentene is a colorless flammable liquid with several isomers. Vanillin is a white crystalline solid.Hexane is an organic compound used as solvent.