Given a scientific question, generate a correct answer to it.

Ex Input:
What type of pressure is the pressure exerted by gas particles in earth's atmosphere as those particles collide with objects?

Ex Output:
atmospheric pressure

Ex Input:
During which phase does dna replication occur in the cell cycle?

Ex Output:
synthesis

Ex Input:
The bones of the skull are connected by what type of joints?

Ex Output:
immovable