1 <~> 1 = 1

In chemistry and biology, units interact (<~>)with each other in a dynamic way rather than having a strictly  additive (or subtractive) relationship.  This infers a more give and take interaction.  The interaction also has context, including a given environment, soace and time.

In chemistry and biology, in a given environment, in space and time, one unit interacts in a dynamic way with another unit to form a new unit with unique characteristics.

In Chemistry

In chemistry, we are mostly dealing with the interaction of negative and positive forces.
At the simplest level. a single electron interacts with a single proton, in space and time, to form the hydrogen atom which has completely different and unique characteristics
The hydrogen atom as a result of the interaction aqquires a magnetic field and starts to spin (or precess) like a spinning top- representing a new and unique characteristic.

 The 1+ 1 = 1 equation is still applicable, since units are additive in the formation of a bigger whole , and the end point “whole” of the interaction is still greater than the parts. 

The “+” in the original equation throughout the common vein will be replaced by a variety of different bonding mechanisms between two units.  For example in human biology the vessels including the arteries, veins, and ducts will bond two or more organs.