How did american entry into world war i affect the allied powers? it boosted their morale. it gave them new weaponry. it ended their battle on the eastern front. it shifted the balance of power against them.

it is the first option (a)It boosted their morale. I just took the test!

leonardo was the supreme renaissance painter, scientist, inventor, and polymath. da vinci is widely regarded as one of the greatest minds the world has ever produced. he was interested in everything from music to art and science. da vinci was an immense creative force at the start of the renaissance period. amongst his many works was the immortal painting – the mona lisa.

hope this : )

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.