Problem: Given the question: 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&#x27;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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The answer is:
Carbon dioxide from the air passes through small pores (holes) in the leaves


Problem: Given the question: What is the missing first step of the following process:  -  The magma cools - Crystals form and the magma become igneous rocks - The igneous rocks break down into sediment - Become sedimentary rocks - If subjected to heat and/or pressure from plate-tectonic activity the sedimentary rocks become metamorphic rock - The metamorphic rocks melt - Become magma again.
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The answer is:
Rock begins as magma from a volcano


Problem: Given the question: What is the missing first step of the following process:  -  The glucose and oxygen create carbon dioxide - The cells release energy - The cells don't have enough oxygen to repeat this - The cells obtain more oxygen from the air - The cells repeat this process.
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The answer is:
