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This is one I took out because I wasn't sure about the yolk and then decided to make sure and ask

This is one that has blood vessels

Hi! Can anyone help me out? This is my first time and I'm trying to learn on my own.. 1. Are blood rings always distinct/fairly obvious? 2. Do yolks move around as you turn the egg? 3. On day 5 would I definitely see blood vessels and a dark spot if the egg were viable? Thanks!