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Living on land required plants to have what ability?
the ability to require, transport, conserve water
without gaseous exchange, what would plants be unable to do?
they would not be able carry out photosynthesis
What does the number of seed leaves distinguish between?
monocots (one seed leaf) and dicots (two seed leaves)
What happened when land environments became drier millions of years ago?
mosses and ferns became extinct
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