Over time, the understanding of the relationships between living things has changed.

We cannot act as if there were always a clear division between such things.

Distance is a measure of the space between two things.

"Between the work and other things, some days I barely see my children."

On the beach these women are between things - the sea and the land.

The word 'switch' can also mean to change between two things.

He could see connections between things that no one else in the force would even guess at.

They do not see a difference between spiritual or material things.

"There was not the kind of formal break between things we have now."

An example to this is heart rate distribution between living things.