Why did the Persians struggle at the Battle of Marathon?

Their armor was too heavy for them to fight in.
Their ships could not get close enough to shore.
Their cavalry could not fit in the narrow mountain pass.
Their archers struggled to fight the Greek infantry at close range.

African-american soldiers in world war ii sometimes felt they were ? ghting for two victories, one abroad and one in europe true or false

Considering the case of the two health clinics above, why do you think that trouble was brewing? there was serious competition for tech jobs at the downtown clinic. the new technology at the uptown clinic was too difficult for the staff to understand. the doctors pitted the staff of one clinic against the staff at other clinic. the staff at the downtown clinic saw that their colleagues at the uptown clinic were treated better and had more opportunity.

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.