But he seemed to have reached his biological limit: 5 feet 8 inches tall, 150 pounds.

Due to the high levels of variation in the chicken genome, the industry has not yet reached biological limits to improved performance.

They can renew themselves indefinitely, suggesting that there is no biological limit on longevity.

But other researchers believe there is no biological limit to how long people can live.

Was the ba right about the fetuses reaching some sort of biological limit in their containers?

Just to see how far the human biological limits can be pushed.

Priority should be given to the east as stocks there are now below acceptable biological limits.

I am, however, concerned at the negative approach the report takes to setting biological limit values.

Additional yield gains are more difficult to achieve as research is increasingly pushing against biological and environmental limits.

Others believe that "we are morally obligated to help the human race transcend its biological limits."