Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

[EX Q]: Paragraph- Sent 1: When land is cleared, habitats are lost.
Sent 2: It may be cleared for agriculture.
Sent 3: It may also be used for building new homes or businesses.
Sent 4: Within the past 100 years, the amount of land used for agriculture has almost doubled.
Sent 5: Land used for grazing cattle has more than doubled.
Sent 6: Many wetlands have also been lost to agriculture.
Sent 7: The U.S. has lost almost all the natural tall-grass prairies.
Sent 8: Thee areas of tall thick grass have virtually disappeared.
Sent 9: These areas of land had thick fertile soil.
Sent 10: Their grasses had very deep root systems.
Sent 11: These deep and thick roots reduced the amount of soil erosion.
Sent 12: They also were home to many plants and animals.
Sent 13: Prairies were wonderful places.
Sent 14: They were home to colorful flowers, prairie dogs, and herds of bison.
Question: What reduced the amount of soil erosion in grass?.
[EX A]: Deep and thick roots.

[EX Q]: Paragraph- Sent 1: Once upon a time I had a dog named Toodles.
Sent 2: He was black and white and had long floppy ears.
Sent 3: He also had very short legs, but really big paws.
Sent 4: Every Saturday we would go to the park and play Toodles' favorite game.
Sent 5: Toodles loved playing fetch.
Sent 6: One Saturday, Toodles ran over to the pond because he saw ducks swimming there.
Sent 7: He ran all around the pond, barking at the ducks.
Sent 8: The ducks ignored him, and kept swimming.
Sent 9: Toodles wasn't having it!
Sent 10: He jumped into the pond and started swimming toward the ducks, chasing around his new playmates.
Sent 11: One of the ducks, braver than the others, poked Toodles with his beak - and then bit him right on one of his floppy ears!
Sent 12: Toodles barked and ran out of the pond because the duck hurt his ear.
Sent 13: Soaking wet, he ran toward where I was eating a sandwich on the grass and curled right up in my lap so I could make him feel better.
Sent 14: After that, whenever he would see a duck, Toodles would run the other way.
Question: What animals are in the park.
[EX A]: Ducks.

[EX Q]: Paragraph- Sent 1: Convicted murderer Seth Baxter awakens chained to a table beneath a pendulum blade .
Sent 2: A videotape informs him that crushing his hands between the presses will release him ; he does so , but the blade still swings down and violently cuts him in half , while someone watches through a hole in the wall .
Sent 3: The scene cuts to Agent Peter Strahm , who kills Jeff Denlon in self-defense and is sealed in the sickroom .
Sent 4: He finds a hidden passage with a tape recorder that warns him to stay in the sickroom , but ignores it .
Sent 5: He is attacked by a pig-masked figure in the passage and awakens with his head sealed in a box slowly filling with water , Which he survives by performing a tracheotomy using a pen .
Sent 6: Outside the plant , Detective Mark Hoffman delivers Corbett Denlon to the police and claims they are the only survivors , and is shocked when Strahm is brought out alive as well .
Sent 7: Jill Tuck is met by John Kramer's attorney , who is administering his will .
Sent 8: She is left a box and a videotape , in Which John stresses the importance of the box's contents .
Sent 9: She opens it with a key hung around her neck and then leaves without disclosing its contents .
Sent 10: In a memorial service held for David Tapp , Steven Sing , Allison Kerry , Eric Matthews , and Daniel Rigg , the five officers killed in action , Hoffman is promoted to detective lieutenant .
Sent 11: He is informed of the death of Agent Lindsey Perez while taking Strahm's phone and goes to the hospital to meet Strahm , who says that Hoffman's name was Perez's last words .
Question: Who is attacked by a pig-masked figure in the hidden passage?.
[EX A]:
Agent Peter Strahm.