input question: What is the missing first step of the following process: - Composition of blood is regulated - Volume of water in blood is kept constant - PH is kept at a constant level - Kidneys help regulate blood pressure - Kidneys stimulate the making of red blood cells - Calcium levels are maintained.???
output answer: Kidneys filter waste out of blood

What is the missing first step of the following process: - The liver uses enzymes to clean the blood - The cleaned blood is expelled - The liver creates bile from the items filtered - The liver takes energy and stores it as glycogen - The bile is sent to the intestines.
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Answer: The liver takes in blood from the rest of the body

Q: What is the missing first step of the following process: - 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 - The owl eats the prey, or carries it back to its perch -
A: Owls hunt around their hunting territory away from where they roost during the day

Question: What is the missing first step of the following process: - The items are sorted - Trash is removed from everything else - Goes to a landfill - The items go into a baler machine for each kind of material - They come out as bales - The bales are shipped to manufacturers to use to make products.
Answer: Items are collected

[Q]: What is the missing first step of the following process: - The cans are transported to a facility - The cans are shredded by a machine - The cans are heated to 1400 degrees to melt them - The molten metal is poured into molds - The molds are flattened and rolled into sheets to reuse.
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[A]: Put the aluminum can into a recycle bin

Problem: Given the question: What is the missing first step of the following process: - Rain falls - Water is in the area of high elevation - The water creates a stream - The stream moves towards lower elevation - The stream continues along the same path for a long time - The soil and rocks erode where the stream touches them - The stream moves deeper into the soil - The stream is smaller than the eroded area.
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The answer is:
An area is at a higher elevation than the surrounding area