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Imagine that to be able to roll your tongue you need two genes, A and B. For each of There is a certain dominant version for each of these genes that lets you roll your tongue. cannot roll their tongue would have a tongue roller for a child. Another example is something called a modifier gene
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This is a scientific model .Water from rivers, seas, ponds, lakes, ... evaporates up high, when cold is high, condenses to form small droplets of water (when they stand close together to form different shapes we call clouds), these small droplets fall on the ground creating rain
Your answers are Eukaryotes and multicellular. Hope this helped!