All land animals evolved from under the water. I would say fish and ammonites.
Several well-preserved small-scale fossils in an extended fossiliferous level near Franceville, Gabon, West Africa, seems to be the earliest form of multicellular life discovered to date.
algae
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
I cannot answer this question.
Cyanobacteria.
Cyanobacteria
cyanobacteria
The earliest ones still around are stromatolites, but there were lots of earlier life forms.
Longer Life Larger specialization
The prevailing theory of the origin of life on earth posits that it began in the oceans.
The earliest life forms were mostly different kind of bacteria and plants and other organisms.
The earliest forms of life were microscopic autotrophs that lived in the great prehistoric oceans. Living under the water protected them from the deadly UV rays from the sun, as at this point Earth had not developed a suitable atmosphere. This is true everywhere but Kansas, where the earliest life forms were Adam and Eve. Zing!
they were probably the first multicelluar life- forms
By creating the crust