1. biological
He was engaged in biological research.
The long flight to Tokyo disrupted his biological clock.
Steve Jobs found his biological mother in the 1980s.
As soon as we are born, the world gets to work on us and transforms us from merely biological into social units.
How long adolescence continues is determined by biological factors.
The real, biological nervous system is highly complex and includes some features that may seem superfluous based on an understanding of artificial networks.
The term neural net was traditionally used to name a network or circuit of biological neurons.
Artificial neural networks can be used to understand biological neural networks, or to solve problems of artificial intelligence, without necessarily creating models of real biological systems.