[Q]: What is the missing first step of the following process: - Fill the tray with water from the faucet - Put the ice cube tray in the freezer - Wait for several hours - The water will freeze and become ice - Remove the ice cube tray from the freezer - Remove the ice cubes from the tray.
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[A]: Take out an ice cube tray

[Q]: What is the missing first step of the following process: - The energy from the sunlight causes an enzyme in the plant to break apart the water - The water breakes into oxygen, hydrogen, and electrons - Hydrogen, along with electrons energized by light, converts NADP into NADPH - Oxygen diffuses out of the plant as a waste product of photosynthesis -
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[A]: Sunlight hits chloroplasts in the plant

[Q]: What is the missing first step of the following process: - These pores are called stomata - Water is absorbed by the roots and passes through vessels in the stem on its way to the leaves - Chlorophyll absorbs the sun's energy - It is this energy that is used to split water molecules into hydrogen and oxygen - Oxygen is released from the leaves into the atmosphere - Hydrogen and carbon dioxide are used to form glucose or food for plants.
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[A]: Carbon dioxide from the air passes through small pores (holes) in the leaves

[Q]: What is the missing first step of the following process: - The fertilized egg, now a zygote, travels to the uterus - The zygote implants in the uterus - The zygote becomes an embryo - The embryo becomes a fetus - The fetus grows for approximately 9 months - The woman gives birth to a baby - The baby grows into a child - The child becomes an adult - The adult mates with another adult -
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[A]:
A sperm and egg meet inside a woman's fallopian tube