Yes, haddock, cod and plaice skins are edible. Though not everyone will eat the skin.
Yes
The skin of the garlic clove isn't edible.
Yes it is.
no it'll hurt your tummy
Yes. Some recipes call for it, like the zest of it or peels of the skin.
Yes, the skin of a cucumber is edible.
yes if you like the texture.
stem, fruit and flowers
yes , im eating it right now
edible food
Yes, it is. You just need to chew it good.
Ignore the orange skin. Concentrate on the edible part. What shape is it? How would you calculate its volume?