By the time of darius, the persian kings had created a. so many assassination plots that the empire was weakened, leading to conquest by genghis khan. b. such high taxes that loyalty to the empire began to decline. c. hundreds of varieties of the game of checkers d. a standing army known as the immortals because whenever a member was killed, he was immediately replaced.

d. a standing army known as the Immortals because whenever a member was killed, he was immediately replaced.

Explanation:

During the Achaemenid Empire, the Persian kings had created a standing army called Immortals because of its heavily-armed infantry consist of short spears, swords, wicker shields, bow and arrow. The army was consist of 10,000 soldiers.  If wounded or killed soldiers replaced. Soldiers during the Achaemenid empire serves as a standing army and as an Imperial Guard.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

age 7 i learned how to ride a bike and skinned my knee

age 10 went on my first vacation to the beach

age 12 got in a car accident with my mom she got whiplash

age 14 i got my first pet and named it ripley

age 16 i got my my first car and it was blue

age 17 got my first job at target

explanation: