Randall jarrell wrote poems that expressed what he had witnessed during his world war ii service. he endured in japanese internment camps. he experienced during world war i. he observed about common americans.

Correct answer is: "He had witnessed during his World War II service."

Explanation:

Jarrell was an American poet,  translator, editor, critic, and novelist , called as "the most heartbreaking" by Robert Loweland.

His first original poems  originate from his experience in the Air Force, where he showed the grim highlights of the wastefulness of war.

1) i we aren't tired, we will go to the forest.

2) you will not see many old oak-trees, and animals will disappear if you don't care of them?

i don't understand the question.

a)   it explains that many people died because medicines and medical practices were not effective.