Yes. It's ice cream.
Yes sherbet is non dairy. It is has no dairy products in it at all.
no they do not
If the biscuits contain Milk solids / Milk / Butter / Yogurt or any dairy product like chocolate it is considered to be a dairy product.
Yes
Yes. All milk and milk products from any source is considered dairy.
No. Traditional sherbet contains dairy products.
No. Yogurt is a dairy product, and whey is considered a dariy by-product.
No, it is not a product of cow-labor such as milk
Yes; sherbert (or when correctly spelled: sherbet) does contain dairy. In the US the legal requirement to be labeled as a sherbet (or sherbert) is that it must contain between 2% and 5% dairy (and or eggs). Above 5% dairy and it can no longer be called a sherbet, it would be an ice cream (or a frozen yogurt if the dairy used were yogurt instead of a cream or milk). Below 2% and it can no longer be called a sherbet, it would be a sorbet. Sorbet is basically flavored ice, and is the precursor to both sherbet and ice cream. It may contain up to 2% dairy, but traditionally you would leave out the dairy entirely if your goal is sorbet (especially since you really need to be over 2% to get any reasonable amount of creaminess from adding it, and at that point you are now making sherbet) Sorbet, sherbet and ice cream are often easily confused. They do all use essentially the same smoothing process; the difference between them is the volume of dairy used. Sorbet and sherbet both traditionally use fruit juice as their primary flavorings (but as with modern ice creams its possible to use almost anything - aside from dairy, which would be change its definition depending on volume)
Dairy ingredients are milk, cheese, eggs, etc. Anything that comes from milk is considered a dairy product (plus eggs). I hope that answered your question.
Pizza is mainly a carbohydrate. Cheese on a pizza is a dairy product, and meat is a protein. Cheese will also be considered protein AND dairy.
only if it is lactose based