Problem: Given the question: What is the missing first step of the following process: - They process it with millions of tiny nephrons - Remove all the waste - The kidneys return the blood back to the body through the renal artery - Send the urine with the waste to the bladder through the ureters.
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The answer is:
The kidneys receive blood from the renal artery

Problem: Given the question: What is the missing first step of the following process: - Mix in milk, eggs, and melted butter - Mix until smooth - Heat a griddle or frying pan to medium high - Pour batter onto the griddle -
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The answer is:
Mix flour, baking powder, sugar, and salt into a bowl

Problem: Given the question: What is the missing first step of the following process: - The lungs have a series of smaller and finer tubes and sacs - Air reaches the smallest and finest air sacs called alveoli - Oxygen travels from the alveoli into the blood - Oxygen-rich blood is carried to the heart - Oxygen-rich blood is pumped throughout the body by the heart - Cells take in the oxygen rich blood and release carbon dioxide rich blood - The carbon dioxide rich blood travels to the lungs - Carbon dioxide travels through the throat and is exhaled.
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The answer is:
Air enters the nose or mouth and travels through the windpipe into the lungs