Hi Erin,
OG #42. Scientists have recently discovered what could be the largest and oldest living organism on Earth, a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single fertilized spore some 10,000 years ago and extending for more than 30 acres in the soil of a Michigan forest.
correct answer is: extending rather than extended
Can I solve OG# 42 by using your method above?
Fungus here is the object: A fungus is spawned => reduced to "spawned"
Whereas, fungus here is the subject: A fungus extended => reduced to "extending"