It is called Negative Space.
Inanimate objects.
A mutually beneficial relationship between two biotic (living) organisms is called a symbiotic relationship.
The variables that must remain the same between the control group and experimental group is are called controlled variables, and include everything except the experimental variable.
The idea that space contained a substance call "aether" which carried light. Michelson and Morley developed a device to measure Earth's motion through it. I was a classic failure, and continues to be.
Check the roof for asbestos marking or the packing that it came in. If you are still trying to figure out if there is asbestos, call the manufacturer and they can give you details.
Postive space
space
Space
INTERSTELLAR
static energy
heat
It's called a constellation.
The internode space. The space between the two leafe nodes. The spaces between leaf veins are called areoles.
The universe
A synapse.
A geometric painting
A gap.