input question: What is the final step of the following process: - Iron is exposed to oxygen - Is exposed to air - A chemical reaction occurs - The iron starts to oxidize???
output answer: The iron starts to rust.

What is the final step of the following process: - Owls hunt around their hunting territory away from where they roost during the day - They sit still on a perch, like a stump of branch, and wait for prey - They use their highly sensitive hearing to locate prey that cannot be seen - They use their very keen vision to see prey in the dark - They fly silently, without flapping their wings, in order to surprise the prey - The owl silently glides or drops on its prey, grabbing it with its talons and beak
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Answer: The owl eats the prey, or carries it back to its perch

Q: What is the final step of the following process: - Fluid - Waste enters the kidneys - A processing moment in the kidneys let waste and fluid pass - Prevents larger molecules to pass - Fluid goes back to the bloodstream - Bad waste is removed
A: The final product is turned into urine.

Question: What is the final step of the following process: - Plants start growing on or near the rocks - The roots of the growing plants start to break up the rock - The plant acids dissolve the rock - The rock is broken down into smaller pieces
Answer: Erosion begins.

[Q]: What is the final step of the following process: - The liver filters blood from the digestive tract - The liver produces bile - The liver produces proteins for blood plasma - The liver converts excess glucose into glycogen for storage - The liver converts ammonia to urea
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[A]: The liver regulates blood clotting.

Problem: Given the question: What is the final step of the following process: - A bird picks a spot high spot, often in a tree - The bird collects bits of sticks and grass - The sticks and grasses are placed between support branches - Leaves, mud and spider webs are added to the sticks - The mud, leaves and webs glue the sticks together
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The answer is:
The solid nest supports the eggs