Diverrsity Of Plants
Beginning of paper
Plants evolved more than 430 million years ago from multicellular green
algae. By 300 million years ago, trees had evolved and formed forests, within
which the diversification of vertebrates, insects, and fungi occurred. Roughly
266,000 species of plants are now living.
The two major groups of p ....
Middle of paper
.... to another of The same
species, thus promoting out crossing. Many angiosperms display other modes of
pollination, including self-pollination.
Evolutionary Origins
Plants derived from an aquatic ancestor, but the evolution of their
conducting tissues, cuticle, stomata, and seeds has made them progressively less
dependent on water. The oldest plant fossils date from the Silurian Period,
some 430 million years ago.
The common ancestor of plants was a green alga. The similarity of the
memb ....
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Word count: 2857
Page count: 11 (approximately 250 words per page)
