Well I have seen advances on soft robotics and robotics in general and many of these breakthroughts include biomimetism or bionics which is a subarea of robotics that attempt to create machines that emulate biological functions using inorganic and nonbiological materials.
Of course some biological functions seems unnecessary for a robot albeit it is possible ( they would help a robot to pass as a living breathing person despite depending on how artifitial their skin look it would give them away) like breathing, digestion(their energy could come from power cells though eating food is fun and have eotional aspects), even a circulatory system is possible but seems superflous because robots could have a wiring/ advanced cable and computing system that could emulate an endocryne system using computer instructions/codes or energy pulses of different frequencies and potencies that could serve as artifitial hormones and help them to achieve emotions and sex drive. However I don't thik it is impossible for robots someday emulate living organisms chemically in the sense that they would have a technology that would allow them to produce chemicals in the same way that our cells do. Organisms can repair themselves and robots could have a nanobots system that would repair them at molecular lewvels and the robots themselves could be made of self healing/maintaining materials. I have read a news about that.