Common evolutionary origins between vertebrates and invertebrates revealed ... Ciona intestinalis, a marine invertebrate animal commonly known as the sea squirt," explains Ryoko Horie, ...

Vertebrates are animals with a backbone, like mammals and reptiles. Invertebrates are animals without a backbone, like crustaceans, molluscs and insects. Mammals breathe using lungs , whereas fish ...

Discovered in the 1950s and first described in a paper in 1966, the Tully monster, with its stalked eyes and long proboscis, is difficult to compare to all other known animal groups.

Q: Have any modern animals adapted to human activity through natural selection? Mike Anglin | Dallas, Texas Human-caused factors have led to anatomical changes in both vertebrates and invertebrates.