For one thing it is biologically impossible to have a single species occur in a number of different places.

Mounting an antibody response to a lab contaminant is biologically impossible.

To become part of a greater umwelt may prove biologically impossible.

If she twinned every time she could have more than four a year, it would be biologically impossible.

Since you are from another system, it would be biologically impossible.

Until Dolly, many had thought such a feat was biologically impossible.

In fact, the numbers were so exaggerated as to be biologically impossible in some cases.

Since then, they've developed at a speed that seems biologically impossible.

As the law now stands, managers must act to restore stocks within 10 years, unless doing so is biologically impossible.

They also say that the rate of increase is biologically impossible because the sturgeon take 15 years to reach reproductive age.