The GADV-Protein World hypothesis is a theory about how life might have started on Earth. According to the hypothesis, simple molecules called GADVs (glycine-activated dinucleotide vesicles) first formed in the oceans of early Earth billions of years ago. These molecules were able to interact with each other in such a way that they could turn themselves into protein-like structures, and could form larger and more complex structures over time. Eventually, these protein-like structures became complex enough to carry out the basic functions of life, such as making energy, responding to stimuli, copying themselves, and eventually evolving into the many different forms of life we see today.