Why is continuity important in films? what can filmmakers do to ensure continuity in their films?

Continuity is important because actors and actresses need to say and do the same things in different takes, and if there is a lack of consistency, it could possibly throw the scene off. They can take photographs of the entire set with the actors and actresses,

What are the choices

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.