This leader made all citizens over thirty eligible to serve on the council and gave more power to the citizen assembly. cleisthenes solon peisistratus socrates

Cleisthenes

Explanation: Every citizen over the age of thirty was eligibleto sit on the council , whose members would be chosen by lot. An Assembly , which included all male citizens , was allowed to veto any of the council's proposals and was the only branch of government with power to declare war.

c 3 branches because idk why they had 3 well when:

you think of it there are still contrys with 3

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.