The biological differences are a result of the fact that the female body is well-suited for reproduction, which changes her body temperature, which in turn makes her, in Aristotle's view, incapable of participating in political life.
ðə bˌaɪəlˈɑːdʒɪkəl dˈɪfɹənsᵻz ɑːɹ ɐ ɹɪzˈʌlt ʌvðə fˈækt ðætðə fˈiːmeɪl bˈɑːdi ɪz wˈɛlsˈuːɾᵻd fɔːɹ ɹᵻpɹədˈʌkʃən, wˌɪtʃ tʃˈeɪndʒᵻz hɜː bˈɑːdi tˈɛmpɹɪtʃɚ, wˌɪtʃ ɪn tˈɜːn mˈeɪks hɜː, ɪn ˈæɹɪstˌɑːɾəlz vjˈuː, ɪŋkˈeɪpəbəl ʌv pɑːɹtˈɪsᵻpˌeɪɾɪŋ ɪn pəlˈɪɾɪkəl lˈaɪf.