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 ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here's what you'll learn when you read this story: When biologists refer to 'complex life,' they almost ...