Categorize the following materials: bronze alloy, mouse growing an ear on its back, porcelain dentures

The materials you've provided can be categorized based on what they are and their typical uses:

1. Bronze Alloy: This is a category of metal alloys. Bronze is a metallic compound made primarily of copper, with about 12-12.5% tin and often with the addition of other metals (such as aluminum, manganese, nickel, or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus, or silicon. Bronze alloys are used for various applications, from making coins and medals to sculptures and musical instruments.

2. Mouse Growing an Ear on its Back: This is an example of a biological and biomedical engineering subject. The famous "Vacanti mouse" had a human ear-shaped cartilage structure grown on its back as part of tissue engineering and regenerative medicine research. This is not a material but rather a living organism that has been the subject of a scientific experiment related to tissue growth and transplantation.

3. Porcelain Dentures: These are classified as biomedical materials or prosthetics. Porcelain is a ceramic material made by heating materials, typically including kaolinite, in a kiln to temperatures between 1,200 and 1,400 °C. Porcelain dentures are dental prostheses used to replace missing teeth; they can be valued for their similarity to natural tooth enamel, both in appearance and in feel.