Final answer:
While garages might have elements that can lead to a fire, it's not precisely common for fires to start there without additional data. Forest fires are typical in grasslands and play a role in the ecosystem. Despite being an insulator, wood lets lightning pass through because of its internal moisture and sap.
Step-by-step explanation:
True or false: It is common for fires to start in an attached garage. While the question doesn't specify a particular type of fire, if we consider the statement in a general sense, garages often contain flammable materials and potential sources of ignition, which can increase the risk of fire. However, stating that fires in attached garages are 'common' may be an overstatement without specific statistical data.
Regarding grasslands, it is true that forest fires are a common occurrence. These fires can be caused by both natural processes such as lightning or by human activities. They play a role in maintaining the ecosystem by clearing old or dead vegetation, which can promote new growth.
As for the statement about lightning and wood, it is true—although wood is an insulator, lightning can indeed travel through a tree to reach the Earth. The moisture and sap inside a tree provide a path for the lightning to follow, potentially causing the tree to explode or catch fire as a result of the lightning strike.