What does the tree symbolize in the oklahoma bombing memorial address

It is more than 90 years old. An American Elm Tree in the heart of downtown Oklahoma City, it survived the bomb’s blast and witnessed one of the worst terrorist attacks on American soil. Today, we call it the Survivor Tree.

Before the bombing, the tree was important because it provided the only shade in the downtown parking lot. People would arrive early to work just to be able to park under the shade of the tree’s branches.

On April 19, 1995, the tree was almost chopped down to recover pieces of evidences that hung from its branches due to the force of the 4,000 pound bomb that killed 168 and injured hundreds just yards away. Evidence was retrieved from the branches and the trunk of the tree.

When hundreds of community citizens, family members of those who were killed, survivors and rescue workers came together to write the Memorial Mission Statement, one of its resolutions dictated that “one of the components of the Memorial must be the Survivor Tree located on the south half of the Journal Record Building block.”

i think it is who. im not sure to be honest

what's the topic we have to write about?