there is no evidence to suggest that humanity has designed or built anything more complex than a living human cell or a bacteria from scratch. The complexity of even the simplest living organisms is incredibly intricate and beyond our current technological capabilities to recreate entirely.
Living cells, whether prokaryotic (like bacteria) or eukaryotic (like human cells), are composed of various biomolecules, organelles, and intricate biochemical pathways that work in a coordinated manner to sustain life. While scientists have made significant strides in understanding and manipulating biological systems, they have not yet been able to create a fully functional living cell from basic building blocks.
In recent years, synthetic biology and genetic engineering have allowed researchers to modify and engineer certain aspects of cells to perform specific functions, but this still involves starting with existing living organisms and altering their genetic makeup rather than creating life from scratch.
It's essential to recognize the vast difference between building something from existing components and creating life from non-living materials. The latter remains a complex and challenging area of scientific exploration, and while there is ongoing research, it remains an elusive goal.
As technology and scientific understanding progress, it is possible that we may one day achieve feats beyond our current capabilities, but as of now, human-designed entities have not surpassed the complexity of naturally occurring living cells or bacteria.