Certain trees, in fact produce seeds only when fire heats them if the fire removes thick shrubs and undergrowth the water supply increases eating other plants and local animals fire also may kill predatory insects or pets that live on and damage otherwise healthy trees, which set of context clues best points to the correct definition of undergrowth in the second sentence. Is it insects past fire or is it thick shrubs, plants and trees or seeds, fire, animals or water plants animals
