Problem: 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 -

A: The diaphragm contracts


Problem: What is the missing first step of the following process:  -  The seeds are dispersed by wind, animals, etc - The seeds reach the ground - Grow into new trees - These new trees produce seeds - The process repeats itself over and over -

A: A tree produces seeds


Problem: What is the missing first step of the following process:  -  Cells in the pancrease release glucagon - The liver in response turns the glucagon into glucose - And releases it into the blood - The blood sugar levels are restored.

A: The blood sugar drops in a body


Problem: What is the missing first step of the following process:  -  The magma starts to cool - The cooling causes atoms in the magma to condense - The condensed magma solidifies - The solidified magma forms minerals.

A:
Magma moves closer to the Earth&#x27;s crust