What, then, could we do to determine a biological origin?

No mystique need surround antibiotics because of their biological origin.

Currently the fossils are thought to be of biological origin.

But what, I ask myself, are its social and biological origins?

A signal of this kind, based on a simple mathematical concept, could only have a biological origin.

They're all the same size and shape, which would imply a biological origin.

It suggests a public that might not be content with science even exploring biological origins.

It will be your responsibility to keep her from knowing the biological origins.

In some cases of biological origin, medical interventions such as surgery or medication may be required.

Even when donors choose to be anonymous, offspring may still find ways to learn more about their biological origins.