The goal of protocols is to rid canned produce of clostridium botulinum endospores.

Commercial sterilization

Explanation:

Commercial sterilization is a process which involves the use of heat, to sterilize and thus ensure the safety of the food products that have a limited shelf life. It is a severe thermal process and ensures that all pathogens that are capable of growing in the product and spoiling it are killed. If the process of commercial sterilization is not used then under normal conditions of storage and handling the food can get spoiled. One of the organisms that commercial sterilization protects against in canned products is Clostridium botulinum. 

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.

When scientist examine data such as historical documents, they are using the "scientific methods"