What does conservation mean as it used in the sentence from the ride of his life today, senior is a conservation scientist at Arizona state university.

The use of the word "conservation" in the given sentence means that Senior is a worker for natural safety, helping in ensuring the safe and correct usage of natural resources and spaces.

Explanation:

The word "conservation" means to protect, save, or preserve things in nature so that they do not get extinct or are completely gone or extinguished.

And as used in the given sentence, the word "conservation" is put together with "scientist" which makes it a compound noun "conservation scientist". And in that, it means that Senior helps in the protection and use of the overall land area, forests, and other natural places. He works with others in ensuring the safe and correct utilization of natural resources.  

the words "slavery," "devils," and "murderer" evoke a sense of disgust.