Problem: What is the missing first step of the following process:  -  The egg hatches into a baby bird - Baby bird eats - Grows into an adult bird - The bird finds a mate - The pair build a nest - The birds lay eggs.

A: A bird lays an egg

Problem: Given the question: What is the missing first step of the following process:  -  The water freezes and thaws - Cracks form in the rocks - Cracks also form when rocks heat up - The rocks slowly break down.
++++++++++++++++++++++++++++++++
The answer is:
Water seeps into rocks

input question: What is the missing first step of the following process:  -  Sound waves move parts inside the receiver - Movement causes the magnet inside to produce eletricity - Electricity is transferred through  a wire or cable - A membrane in the other persons phone is vibrated by the magnet in their telephone - Sound is produced - They hear you.???
output answer: You speak into the receiver on your phone

What is the missing first step of the following process:  -  Owls sit at high points in trees and look around - When an owl spots a rodent they track it - When the rodent is standing still the owl swoops down - The owl grabs the rodent with their tallons - The owl uses their beak to eat the rodent.
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Answer: Owls have specially adapted eyes that see better at night

Q: What is the missing first step of the following process:  -  The dishwasher is closed - The dishwasher heats water to a hotter temperature - The dishwasher directs water toward the dishes through jets - The dishwasher adds detergent - The dirty water drains out - The dishwasher sprays more water to rinse the dishes off - The water drains out again - The dishwasher directs warm air toward the dishes to dry them - The dishes can be removed.
A: Dirty dishes are placed in the dishwasher

[Q]: What is the missing first step of the following process:  -  Sulfur in the coal combines with oxygen to form sulfur oxides - The sulfur oxides are released into the atmosphere - The sulfides combine with oxygen in the atmosphere to form sulfur trioxide - The sulfur trioxide reacts with water in the atmosphere to form sulfuric acid, a very strong acid - The sulfuric acid makes the rain acidic -
****
[A]:
Coal is burned