Everything she said is right. But sometimes a picture is worth a 1000 words. Take a bean or pea seed and rub the skin off of the seed. What have you got? a seed with two halves. When you plant this seed you are going to get two seed leaves or cotyledons. Now try this with a corn seed. Remove the skin and now you have one seed, so one leaf gros you will have one leaf (same as gr)
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