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biogeography
Nobody "found" plants because plants were already abundant by the time humans came around. So in a way, I guess you can say that the first humans "found" plants, or rather discovered them.
plants race to grow tall because they want to reach the sunlight
Yes. Humans pollute the earth which hurts plants, they cut down trees which kills them, spray poisons on plants to kill plants they don't want, and genetically modify fruit and vegetable plants with poison inside them to kill bugs.
Because humans consume and use animals and plants for many things. If the animal/plant is diseased, it may spread to humans.
they give oxygen to humans.
They don't. Plants were just fine before humans were ever around.
biogeography
[Inappropriate answer removed]
Plants are the mainstay of agriculture. Crops are comprised of plants, and livestock are very commonly herbivorous animals that depend on plants for growth, survival, and health. If plants did not exist on this earth, every living thing known to mankind would not exist either, and that includes humans. Weather that affects crops or any change in climate can negatively (or in some cases, positively) affect supply in terms of food distribution, harvests, etc.
It can affect us humans because then they can get more PROPER medications that will actually work while on the other hand if plants were not healthy they would probably harm humans rather than "fix" them.
Nobody "found" plants because plants were already abundant by the time humans came around. So in a way, I guess you can say that the first humans "found" plants, or rather discovered them.
plants race to grow tall because they want to reach the sunlight
Yes. Humans pollute the earth which hurts plants, they cut down trees which kills them, spray poisons on plants to kill plants they don't want, and genetically modify fruit and vegetable plants with poison inside them to kill bugs.
Because humans consume and use animals and plants for many things. If the animal/plant is diseased, it may spread to humans.
We wouldn't have any trees,fruit,vegetables or plants
Birds affect plant distribution in many ways.Eating seeds, and distributing them through waste.Burying seeds for later use, and leaving them.Eating the plants, slowing growth.Eating bugs that would otherwise eat the plants, speeding up growth.