x86_64 Assembly Linux System Call Confusion

Question

I am currently learning Assembly language on Linux. I have been using the book \'Programming From the Ground Up\' and all the examples are 32-bit. My OS is 64-bit and I have

Answer 1

If you check /usr/include/asm/unistd_32.h exit corresponds to 1 but in /usr/include/asm/unistd_64.h exit corresponds to 60.