What is the difference between a scallion, onion and garlic?

Onion planting questions?

I know this is a gardening question, but I tend to get more answers from the V&V section. These questions may make me sound stupid, but bare with me.
1.) When I plant an onion seed, does it produce 1 onion or many onions?
2.) Are my scallion seeds and my onion seeds the [...]

Is scallion and spring onion the same?? If its not, can anyone kindly explain how can I identify them?

I’m planning to make takoyaki (octopus balls) and I’m quite new to cooking.. I really don’t know the difference between…. different vegetable tthat may look alike,.please help,. thankx,. ^-^

If you plant a fully mature green onion, can you actually grow more onions?

Ok, so my mom put an old onion in a plastic bag, and sealed it, and put it in the fridge. After a few weeks, we checked on it, and it actually grew scallions!!!!!
So she’s wondering: If we actually plant a whole green onion (in soil, not a plastic bag), will it actually cause it [...]

What is the green plant growing out of an onion?

I know that the green plant from garlic is edible because someone once told me to plant it and i got garlic chives. Now I put an onion in water. It grew roots, and after a week or two started growing something green. Is this a scallion? It doesn’t look like it. Is it edible? [...]