No, oxygen didn't catalyze the swift blossoming of Earth's first multicellular organisms. The result defies a 70-year-old assumption about what caused an explosion of oceanic fauna hundreds of ...

Researchers find that oxygenation of Earth's surface is key to the evolution of large, complex multicellular organisms ... dose-dependent -- our planet's first oxygenation would have strongly ...

Earth life may not be so improbable ... is prevalent in the evolution of multicellularity because the first multicellular organisms were only a mutation away from being strictly unicellular." ...

The first animals on Earth laid the foundation for the vast diversity of life we see today. Their evolution from simple, soft-bodied organisms to more complex creatures with specialized structures ...

An international team of researchers claims that the first species of giant land organisms ... ever existed on Earth are traditionally classified into three classes — bacteria, archaea, and eukaryotes ...

Then around 700 million years ago during Snowball Earth—a geologic era when glaciers may have stretched as far as the Equator—a new creature burst into existence: the multicellular organism.

The hard-boiled detectives came to their conclusion based on a single-celled organism that long ... well before the first animals appeared on Earth,” said biochemist and study lead author ...

Scientists have identified a new species of microscopic worms living in the ground below South African mines, isolated from fracture water gushing up from miles below the Earth's surface. It is the ...

The earliest animal likely used chemical signaling to evolve from a single cell to a multicellular organism, according to a study led ... one of the biggest transitions in the history of life on earth ...