Why is evolution considered a theory A. It is backed up by scientific evidence
B. It cannot be proven
C. It is a guess about what happened
D. It was proposed by a scientist

It's because it can only be proven by scientific evidence

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.

b - the respond is innate and varies over time.

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