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Trilobites
Multicellular organisms first appeared during the Vendian period.
The first organism appeared during the Proterozoic period. It is estimated that the first organism appeared between 2.5 and 3.8 billion years ago.
simple prokaryotes
fish
The period, you mean? They first appeared during the Devonian Period.
Since we don't actually know which organism appeared first, there's no way of knowing what came second.
Cenozoic.
Multicellular organisms first appeared during the Vendian period.
Triassic Period! :)
The range would be the span of time between the point in the geologic record the fossil organism first appeared to the point in the geologic record that the organism last appeared.
No. Answer No, flowering plants (angiosperms) first appeared (as far as we know) in the Cretaceous period.