Choose a background or upload your own photo, then download a shareable quote image.
Your file stays in the browser; nothing is sent to the server.
Choose a background or upload your own photo, then download a shareable quote image.
If new species arise very rapidly in small, peripherally isolated local populations, then the great expectation of insensibly graded fossil sequences is a chimera. A new species does not evolve in the area of its ancestors; it does not arise from the slow transformation of all its forbears. co-author with Niles Eldridge