Many biologists regard birds as the descendants of dinosaurs, but others believe birds and dinosaurs evolved separately from some distant common ancestor.

Some biologists regard this as the only, or at least as the predominant, mechanism of speciation, whereas others take a more pluralist view.

He concluded: "the whole evolutionary process, both cosmic and organic, is one, and the biologist may now rightly regard the universe in its very essence as biocentric".

Nevertheless, many biologists regard the lungfish as the likelier tetrapod ancestor because of its transitional breathing apparatus.

But Dr. Miller and most other molecular biologists regard this idea, called "panspermia," as begging the question; the origin of life on that hypothetical distant planet still must be explained somehow.

If the program is to be ended anyway, does it matter that many biologists now regard its sound pulses as harmless to wildlife?

But I eventually came to realize that working biologists regard Gould much the same way that economists regard Robert Reich: talented writer, too bad he never gets anything right.

Though there are small breaks in the filaments that join the parts of this mighty organism together, biologists regard it as a single individual.

Most biologists regard natural selection as an adequate (although not fully understood) and more plausible explanation for the evolution of life on Earth.

Most biologists regard this taxon as extinct, but the name is sometimes used in the classification of lampreys because lampreys were once thought to be related to cephalaspids.