Modern humans first appeared during the
Amost recent period of the Cenozoic era.
Bmost recent period of the Mesozoic era.
Cearliest period of the Cenozoic era.
Dearliest period of the Mesozoic era.
Amost recent period of the Cenozoic era.
Bmost recent period of the Mesozoic era.
Cearliest period of the Cenozoic era.
Dearliest period of the Mesozoic era.