If intelligent extraterrestrials visited earth 475 million years ago, and then again 300 million years ago (at the close of the carboniferous period), what trends would they have noticed in earth's terrestrial vegetation over this period?

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Bunicellular.dinoflagellates are unicellular or multicellular, producers, and autotrophs, and apple trees are multicellular, producers, and autotrophs. all plants have numerous cells in them, so they can never be unicellular. the remaining characteristics they share with less complex organisms such as dinoflagellates.

Carrying capacity. determining the caring capacities for most organisms is fairly straightfoward.