Which animal is often used to model human body systems?
pig
rabbit
cow
sheep

Rabbit is often used to model human body systems

Recent advancements in mammalian and rabbit genomic studies have reaffirmed the rabbit as a prototype genetic system. They have genomes that are almost identical in size and are thought to have split 80 million years ago from a common origin.

Rabbits have counterparts to almost all human genes.

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Pig

Explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.