What are some common by-products of the animal industry?

The selection of hide, bone, horns, and meat as common by-products of the animal industry is well-founded as these materials are typically derived from livestock and are integral to various economic sectors.

Hide refers to the skin of the animal, which is processed into leather, a highly valued product in fashion and upholstery industries. Bone, often ground into meal or used to produce gelatin, is significant in food processing and agriculture. Horns can also be processed into various products, including tools or decorations. Meat, of course, is the primary product from livestock, serving as a crucial protein source in human diets.

This choice encompasses the various derivatives that arise from the animal harvest, highlighting their multifaceted utility in both food production and other industry applications. The interconnection between these by-products and the main products reflects the efficiency and sustainability in agricultural practices, where multiple components of the animal are utilized, thereby minimizing waste and maximizing economic gain.

The other options, while they include relevant by-products, do not encompass that same breadth of utility and direct association with the primary products derived from livestock.