sudo whoami vs sudo echo `whoami`

Question

Simply put, why is this? Wouldn't it make more sense that sudo echo whoami returns root too?

Cheers

me:~$ whoami
me
me:~$ sudo whoami 
root
me:~$ sudo echo `whoami`
me

Answer 1

This is happening because whoami get substituted prior the sudo and echo. Basically:

sudo echo `whoami`

first becomes

sudo echo me

and then it sudo get executed.