<span>There wasn't many vaccinations back in the day and medicine slowly developed through years passing by. Also eras such as the Black plague and others really helped develop medicines and vaccinations moving forward for people to use.
Hope this helps.</span><span />
here is this off google hope this helps you
: Pericles brought the city-states of the Delian League, which was established around 478 BC, under the leadership of Athens. Among Pericles' other accomplishments was the commissioning of many of the architectural wonders of Classical Athens, including the Parthenon, which was built between 447 and 432 BC.
<span>Mass extinctions when at least half of all species die out. The largest mass extinction event occurred around 250 million years ago, when perhaps 95 % of all species went extinct. Now new ones appeared.
It was during Cretaceous.
Hope this helps !
Photon</span>
All of the above would be your answer
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