You get a slice of pizza for lunch what part is the lipid what part is the carbohydrate and what part is the protein

If you have a slice of pizza, a standard pizza that is, and we divide the parts in the simple manner as it is in the question, than the lipid will be represented by the cheese/yellow cheese part of the pizza, the carbohydrate will be represented by the bread part of the pizza, and the protein will be represented by the meat part of the pizza.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

the answer is:

carbon dioxide