It is a simile, because it used "like" in the comparison.
Answer:
Elijah McCoy was born on May 2, 1844. this would be the 19th century
I believe that the book would be trying to teach others about perseverance and to keep going no matter what.
Answer:
Let -> Leave
Explanation:
What makes more sense? Snakes will usually not harm you if you ____ them alone and keep a safe distance.
Let or Leave?
Leave!
Snakes will usually not harm you if you leave them alone and keep a safe distance.
So, change let to leave! :)