20) Who certifies the quality of those who issue ISO 9000 quality certificates?

O Inmetro. It accredits certification bodies so that they are able to issue quality certificates to other companies. Inmetro, in turn, is recognized by the International Accreditation Forum (IAF), an association of accreditation bodies that regulate ISO certifications.

i don.t know what are you talking about.

i don't know that much about photography