A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

Cladogram: a branching diagram that represents ... to differences in size and shape between males and females of a species. Bilsborough, A., & Wood, B. A. Cranial morphometry of early hominids ...

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.

The worksheets feature multiple choice questions, short response questions, and cladogram drawings ... and how we make connections between all the species that have ever lived on Earth.

Crustacean With Panda-Like Coloring Confirmed to Be a New Species Oct. 24, 2024 — Decades after it was first found in Japan, a crustacean species with unique black-and-white coloring resembling ...

The Earth is currently experiencing its sixth major extinction event. One million species globally are at risk of extinction in the next few decades, including 27 percent of the world’s mammals, 41 ...

A species is a distinct group of organisms and the most basic unit used to measure life on Earth. However, there’s no single definition of a species, meaning this vital concept in biology can be ...

There are now at least 13 species of finches on the Galapagos Islands, each filling a different niche on different islands. All of them evolved from one ancestral species, which colonized the ...

This plant family comprises around 34,000 species, ... Sep. 23, 2024 — Researchers working in Finland propose that the unique light environment of the Earth's Polar regions creates conditions ...

Florida International University (FIU) scientists have finally identified a new species of hammerhead shark years after first collecting samples, but the shark's official discovery comes as its ...

If we lived in an ordinary time—time here being understood in the long, unhurried sense of a geologic epoch—it would be nearly impossible to watch a species vanish. Such an event would occur ...

A species is a group of living organisms that are all broadly similar and can, at least in principle, breed with one another. This seems straightforward enough, but the word “species” is ...