Final answer:
In the Greek assembly, only free adult men had the ability to speak and participate. Free women, slaves, and non-citizens were excluded from political participation.
Step-by-step explanation:
In the Greek assembly, the ability to speak and participate was limited to free adult men who were considered citizens with full legal and political rights. They had the right to vote, be elected into office, and bear arms. Free women, slaves, and non-citizens were excluded from political participation.