input question: What is the missing first step of the following process: - The particles remove small pieces of the rock each time they touch the rocks - The particles continue to hit, brush against, or grow against the rocks - The rock eventually is broken apart by this contact - The pieces of the rock are now small rocks - The rock pieces are worn away into smaller and smaller pieces by the same forces -???
output answer: Particles in the environment interact with rocks

input question: What is the missing first step of the following process: - The basidia gives off spores - The spores germinate - The spores create Hyphae - Multiple Hyphae meet and converge - They join with Mycelium - A hyphal knot forms in the ground - A primordia shoots out of the ground - A mushroom cap is formed.???
output answer: A mushroom gives off gills lined with basidia

input question: What is the missing first step of the following process: - Two types of proteins exist in filaments in the muscles - The filaments move when the brain instructs them to - The motion of the filaments cause the muscle to shorten and contract - Opposing pairs of muscles exist in order to provide the necessary range of motion.???
output answer: Electrical signals in the brain travel through nerves to muscles

input question: What is the missing first step of the following process: - Carbon dioxide from the burning fossil fuels enter the atmosphere - The make-up of the atmosphere changes - Some energy from the sun cannot escape back through the changed atmosphere - The earth begins to heat because of the extra trapped energy - Human beings cut down trees - Human beings do not re-plant the trees - Trees cannot help take the extra carbon dioxide from the atmosphere - The extra trapped energy starts to change the earth's short term weather - Eventually the long-term climate patterns start to change -???
output answer:
Human beings burn fossil fuels (oil, gas, etc.)