The Gruffles just had a rumble with the Gadflies because three Gadflies tried to pass through the Gruffles territory The rumble would be an example of the Gruffles protecting their?

That parental figures play a big part in a child's life and the absence of them can ruin their life.

Bad gas.Could be a natural function of the idle. If the sound is loud, rough, and uneven, yet the car runs smoothly everywhere else, it might be the way the car is tuned.

My stomach made a large rumble, I figured that meant I was hungry.

Literally, a gadfly is a fly that bites livestock, esp. a horsefly, warble fly, or botfly.Figuratively it is an annoying person, esp. one who provokes others into action by criticism.

It happens by the refraction of light.