What is a cluster?
a.) plasma emission from the sun b.) cosmic rays in the solar system c.) portion of space containing many planets d.) portion of space containing many galaxies

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling

During the 1800s. hope this !

Ithink the answer is d