a planty purpose

Do plants feel pain? Some say yes. Some say no. Nonetheless, there is a planty purpose.
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Many plants use fruits and their consumption as part of a reproduction strategy. When they got humans in on their game, they got their reproduction to skyrocket.
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Take the tomato. Tomatoes were once found only in South America. Now they can be found everywhere. Admittedly, not all fruits that are eaten find their seeds producing new plants, but enough do to make the practice well worth while, the case all over the plant kingdom. Enough seeds are extracted out of tomato fruits for reproduction purposes for the tomatoes to keep producing tasty fruits.
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Most life forms find birth a painful process.