How does natural selection change thephenotypes within a population over time?

Phenotype is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. Essentially its physical characteristics. According to natural selection, some characteristics are more likely to survive and thus pass on to children of a generation. Therefore, over time said characteristics such as the ability for an organism to blend in with its environment get passed along and become more prominent within a population ultimately making the appearance (or phenotype) of the population more synonymous with the characteristics "chosen" by natural selection.    

Explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

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