The best replacement for human body is animal cell.

The best alternatives to human body are rated as following:
★★★★★  animal cell
★★★  anatomy
★  computer system

Your alternative for human body is not listed? Suggest!
Speaking about human body, one probably shouldn't forget about animal head.

Other search terms related to human body and their ratings are:
★★★★★ animal head
★★ dog head
horse head
You have in mind a companion for human body and it is not yet here? Propose!



Google Trends

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human body
animal cell
anatomy