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.

Input: Consider Input: Paragraph- Sent 1: Static electricity is like a teeter-totter.
Sent 2: What happens if a teeter-totter is balanced?
Sent 3: Correct!
Sent 4: It does not move.
Sent 5: What about when its not balanced?
Sent 6: Yes, it will now begin to move.
Sent 7: Charges move when they are not balanced.
Sent 8: Charges can build up by friction.
Sent 9: Maybe you rub your feet on a wool mat or carpet.
Sent 10: Rubber soled shoes readily gain charges.
Sent 11: The wool carpet easily gives up charges.
Sent 12: The two items become unbalanced.
Sent 13: One item has a positive charge.
Sent 14: The other has a negative charge.
Sent 15: The difference in charge is called static electricity.
Sent 16: Just like the teeter-totter, something is going to move.
Sent 17: Positive charges build up on the mat.
Sent 18: Negative charges build up on you.
Question: What happens if static electricity is not balanced?.

Output: There would be a positve or negative charge.

Input: Consider Input: Paragraph- Sent 1: Roger was a grasshopper.
Sent 2: He loved to hop.
Sent 3: He hopped everywhere by himself.
Sent 4: One day when he was hopping around he bumped into a frog sitting on a log.
Sent 5: The frog told him his name was Gilbert.
Sent 6: Gilbert told Roger that it had been a long time since he bumped into anybody.
Sent 7: Roger told him that since both grasshoppers and frogs like to jump they would make great friends.
Sent 8: The next day they were hopping through a field and they saw something very strange.
Sent 9: In a pond they saw a spider floating on a lily pad.
Sent 10: The spider was very sad because he did not have any friends.
Sent 11: Roger and Gilbert asked him why he didn't have any friends.
Sent 12: The spider told them that everybody would scream and run away when they saw him.
Sent 13: Roger and Gilbert told him that he didn't look scary to them and that he could come along with them if he wanted.
Sent 14: So Sam the spider said yes, and the three of them began a life time friendship full of adventures.
Question: Which two characters saw something strange?.

Output: Roger and Gilbert.

Input: Consider Input: Paragraph- Sent 1: Many plants and animal species have lived on Earth.
Sent 2: Most are no longer alive.
Sent 3: Only a tiny number of species still live on Earth.
Sent 4: If not for fossils, we would know little about species that did not survive.
Sent 5: Fossils provide evidence.
Sent 6: They give us clues to past life on Earth.
Sent 7: They tell us that life on Earth has changed over time.
Sent 8: Fossils in younger rock Fossils can also tell us about how plants and animals lived in the past.
Sent 9: Was it land or marine?
Sent 10: Was the water shallow or deep?
Sent 11: Fossils can even provide clues to ancient climates.
Sent 12: They can tell us if it was warm or cold.
Sent 13: Maybe it was cold or hot?
Sent 14: Some places that are now cold were once warm.
Sent 15: Some places that are now hot and dry were once wet and cool.
Sent 16: Fossils provide a window into the past.
Question: What purpose did fossils provide?.
Output: Evidence.