This hypothesis not only flouts accepted biological principles but is unnecessary.

This applies particularly to an understanding of the biological principles underlying the reproductive process.

Indeed, even human sexual activity, he rather disconcertingly suggests, does not have its ultimate explanatory source in that biological principle.

Today a few theorists are starting to question the mechanistic approach and model business on biological principles or chaos theory.

Certain biological principles can help overcome the mathematical difficulties.

Animals that spend time as larval plankton illustrate two interesting biological principles.

Indeed, they are not even based on protoplasmic biological principles.

I even understood the biological principle behind the spurious theology.

"It seems to be a general biological principle that this can happen in viral infections," he said.

By contrast, mechanistic approaches create a mathematical model based on biological principles and then test how well these models fit real data sets.