This document discusses the benefits of studying plant and animal cell engineering. It argues that this field can solve problems with overpopulation and underpopulation by growing food and organs. It also claims cell engineering can improve public health, lengthen lives, protect the environment, and bring back extinct species. However, it notes there are also ethical issues regarding who controls this technology and information. It discusses using cells for organ regeneration, drug production, and as bioreactors. While cloning cells could provide body parts and insurance, it raises bioethical concerns that must be addressed.