In fact, one-celled organisms may have been the only things released from the spacecraft.

I think he's got higher expectations of one-celled organisms than he does of me.

When and how had he been divided in two halves like a one-celled organism repro-ducing itself?

More like a simple one-celled organism or a sponge.

The entire genome-maybe several genomes-exists in the one-celled organisms released from the spacecraft.

Nothing but specialized forms of these same one-celled primitive organisms!

All five of these kingdoms have lineages that trace back to different one-celled organisms.

In the video's introduction, a narrator states, "From these one-celled organisms evolved all life on Earth."

All types of bacteria are one-celled organisms that live either alone, in chains, or in groups.

Parasites range in size from tiny, one-celled organisms called protozoa to worms that can be seen with the naked eye.