Question

olution and earth historyscientists think that all of life on earth originated from which type of organism?single-cell prokaryotesmulticell animalsstromatolitessingle-cell eukaryotes

Explanation:

Fossil and genetic evidence shows the earliest life forms were simple, single-celled organisms without a nucleus (prokaryotes). All other life forms evolved from these ancient prokaryotes over billions of years. Stromatolites are microbial mats, not a life form origin, while multicellular animals and single-cell eukaryotes appeared much later.

Answer:

single-cell prokaryotes