Which is true of the particles in a solid?

They are packed together in fixed positions.

The have indefinite mass and definite volume.

The are connected but are able to move freely.

They continue to expand to fill the available space.

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

Ascientific blank must be testable and capable of being proven false?

What are the north and south poles of a solenoid change with?