Problem: Given the question: What is the missing first step of the following process: - The lungs expand - Air is pulled from outside the body, into the lungs - The membranes in the lungs collect oxygen molecules - Oxygen is transferred to red blood cells - Red blood cells distribute oxygen throughout the body -
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The answer is:
The diaphragm contracts

Problem: Given the question: What is the missing first step of the following process: - The egg hatches to form a larva, also called a caterpillar - The carterpillar molts (loses its skin) many times as it grows - The caterpillar then forms itself into a pupa, or chrysalis - The caterpillar in the chrysalis begins change, a process called mmetaphorphosis - The caterpillar completes its metamorphosis and has turned into a butterfly - The adult butterfly emerges out of the chrysalis and flys away! -
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The answer is:
The butterfly starts as an egg

Problem: Given the question: 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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The answer is:
The liver takes in blood from the rest of the body