During the late Precambrian, about 560 million years ago, the first confirmed macroscopic multicellular organisms appeared. Around 558 million years ago, the first mollusk, Kimberella,appeared in the fossil record.
segmentation
Archiac Period
The caveman were one of the first
you are not supposed to have a period while pregnant. Most women do NOT get their period when pregnant. Some may have slight bleeding here and there. It will be red. I have heard of quite a few woman who do indeed experience a kind of period in their first trimester and some who have had periods all the way through. So, don't listen to the first answer.
Fish first appeared in the Cambrian period, long before the Devonian.
The period, you mean? They first appeared during the Devonian Period.
Ammonites first appeared during the Devonian Period within the Paleozoic Era.
Multicellular organisms first appeared during the Vendian period.
Devonian Period
Devonian Period
The first insects appeared in the Devonian, over three hundred fifty million years ago.
The first land vertebrates appeared in the: Devonian
Insects are one of the oldest groups of organisms, with fossil evidence suggesting they appeared around 400 million years ago during the Devonian period.
the Devonian Period is commonly called the Age of Fishes because it was the time where the first boney fishes fossil were discovered
Multicellular organisms first appeared during the Vendian period.
No. Although there were amphibians the Jurassic, they first appeared in the Devonian.