Carl Von Linneaus developed the system for classifying organisms.
"The density of a substance determines how much light is refracted"
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There are inner part of the stem and outer part of the stem; in a plant the inner part supports the movement of the water and nutrients. You stop the flow of the vital elements of plant growth when you snap the stem and this is the reason why the plant die due to starvation of the nutrients.
The answer to this question is Gene
