Because a brownie is a baked good with several different ingredients it does not belong to one specific food group.
none
Brownies generally border too food groups, "carbohydrates" and "fats". However some people include the food group "sweets (and other bad foods)"; which should only be 5% of your diet. If you consider that to be one of your food groups, brownies definitely belong in there as opposed to "carbohydrates" and "fats" groups, which should usually be reserved for more healthy food choices.
The macaroni would be grain and the cheese would be dairy.
The group that the beetroot vegetable belongs too is the root vegetable.
Group 15
presumably a spice but im 12 so im probs wrong
Eqqus
insect
chordata
amphibians.
nitrogen belongs too group 15
Mammals
they belsong to the molusca group.