Evaluate Which two threats to marine
ecosystems do you think are the most serious?
Why?

Oil spills and overfishing

Explanation:

Oil spills are the most dangerous as they harm the entire environment around them

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.