Question: What is the missing first step of the following process:  -  Blood is carried to the kidneys through the renal arteries - The kidneys contain filters inside - The filters capture the waste products - The waste is combined with water to make urine - The urine leaves the kidney and is collected in the bladder - The cleaned blood is returned to the body.
Answer: Waste products are deposited in the blood

[Q]: What is the missing first step of the following process:  -  The plant roots begin to grow - Break apart the rock - The plant acids dissolve parts of the rock - The rocks are broken into more and more pieces - Erosion starts to occur.
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[A]: A plant grows near or on a rock

input: Please answer the following: What is the missing first step of the following process:  -  The rain seeps into the wood surface - It permeates the wood - When rain evaporates it leaves the wood - It takes the finish of the wood with it - The wood begins to lose it's luster - It begins to look bad - It has pieces of paint missing from the rain - It gets worse when it rains - It eventually will have no paint left.
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output: Rain falls on wood

Please answer this: What is the missing first step of the following process:  -  Water droplets are in clouds - The air gets cold - Water droplets turn into ice crystals - Ice crystals in clouds stick together and become snowflakes.
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Answer: Water evaporates from the ground up to the sky

Problem: What is the missing first step of the following process:  -  The plants and floor absorb the the sunlight - The absorbed sunlight is converted to heat - The heat cannot escape the glass - The heat is trapped in the greenhouse - The hot air rises - The colder air at the top is pushed to the bottom - The colder air is then warmed by the floor and the plants.

A: Sunlight passes through the glass into the greenhouse

input: Please answer the following: What is the missing first step of the following process:  -  The brain tells blood vessels to dilate - The sweat glands become active - Moisture is released from the pores - The moisture evaporates - The evaporation causes cooling.
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output:
Body temperature rises