Earth's population is estimated to be roughly 8 billion people, according to the United Nations. Depending on body size and thus the surface area of skin, a person could have more than 8 billion ...

A reddish-brown sporophyte can be seen at the top center of a leafy gametophore. This capsule contains numerous spores inside. Mature sporophytes like these were individually collected and used as ...

Tiny life forms tucked into debris from an asteroid hit could catapult to other planets—including Earth—and survive, a new Johns Hopkins University study finds. The work demonstrates that a certain ...

Scientists at Nagoya University in Japan have identified the genes that allow an organism to switch between living as single cells and forming multicellular structures. This ability to alternate ...

Researchers mapped enzyme sequences from several thousand modern species onto an evolutionary tree of life. Their findings suggest that, shortly after cyanobacteria evolved the ability to produce ...