• Flowers first appeared 140 million years ago and before that, ferns and cone-bearing trees dominated the earth.
• Some plants produce toxic substances that kill other plants.
• Mimosa Punica is also called a sensitive plant because it would fold up its leaves when it is touched.
• Some plants such as orchids do not get all of their nutrients from the air.
• Several centuries ago in Holland, tulips were more valuable than gold.

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