The element nitrogen is critical in the living world. It is a basic building block of structural and regulatory proteins, nucleic acids, and chlorophyll...
Insects such as the ubiquitous butterfly belong to the huge phylum Arthropoda (creatures having paired, jointed appendages and a chitinous exoskeleton)....
The fossil record clearly shows insects have always been insects.
In a recent study, researchers led by biologist Richard J. Knecht, a Ph.D. candidate...