Gould's sympathetic treatment of Richard Goldschmidt, the controversial geneticist who advocated the idea of "hopeful monsters," only exacerbated the matter, which lead some biologists to conclude that Gould's punctuations were occurring in single-generation jumps.

Two brothers, one a retired, but influential cleric (Franklyn) and the other a biologist of note (Conrad), independently conclude that humans must increase their lifespans to three centuries in order to acquire the wisdom and experience needed to make complex civilizations functional.

But biologists who analyzed the mitochondrial DNA of the Darwin's fox, the chilla fox and the third Chilean fox, the culpeo fox, have concluded that Darwin's fox is, in fact, a distinct species, just as Darwin surmised.

Although viruses have such a simple structure, biologists do not conclude that they are necessarily 'primitive'; that is, that they evolved a very long time ago as precursors of more complex organisms.

At the first Peregrine Conference in 1965, biologists concluded that the Peregrine Falcon was in serious decline around the world.

Judge Zilly did note in his opinion that biologists in the wildlife service had concluded that current levels of logging on Federal lands "are likely to lead to the extinction of the subspecies in the foreseeable future."

In principle," the consortium's biologists concluded in their report, "the string of genetic bits holds long-sought secrets of human development, physiology and medicine.

The biologists concluded that trout were the main cause of the frog's disappearance because the stocking of fish was the only significant difference between the two pristine preserves.

A single variety of fungus is grown in each nest, but most lower attine species cultivate at least two of the four fungal lineages, suggesting that varieties are exchanged among species every so often, the biologists concluded.

All the released iguanas have survived, leading Mr. Hudson and other biologists to conclude that the lizards are "hard-wired" for life in the wild.