Animals, from worms and sponges to jellyfish and whales, contain anywhere from a few thousand to tens of trillions of nearly genetically identical cells. Depending on the organism, these cells arrange ...

Here's what you'll learn when you read this story: Single-celled organisms aren't often associated with complex functioning, but a new study suggests that at least some protists exhibit what's known ...

One-celled organisms began influencing life once their descendants achieved multicellularity. Researchers once thought that this multicellularity transition was rather explosive, but it turns out that ...