There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.

Researchers have elucidated the evolutionary origins of placodes and neural crests, which are defining features of vertebrates, through lineage tracing and genetic analysis in Ciona intestinalis, a ...

Invertebrates, like vertebrates, are classed by body form, life cycle, and evolutionary history. Invertebrates are animals that lack a backbone or bony skeleton.They vary in size from microscopic ...