They gave up the ability to make stone tools and fishing equipment and clothing because the population of about 4,000 people was simply not large enough to maintain the specialized skills necessary to keep the technology they had.
Va perdre la capacitat de crear estris (d'os), aparells de pesca i roba perquè la població, d'uns 4.000 habitants, no era prou nombrosa per conservar les habilitats especialitzades necessàries per no perdre la tecnologia que tenien.