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A conditioned stimulus when paired with a bell. When the bell was rang food was presented. So upon hearing the bell the dog would salivate because he knew simply put food would then follow. This became known as classical conditioning.
A strand of DNA is in the double helix structure.. you can think of it as two interconnected spiraling stairs
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Diffusion is the process of water/molecules moving from a high density to a low density, usually through a cell membrane. I can’t understand the question “why is imo”. Hope that helps some