please explain how work follow program

#include <stdio.h>
#include <stdlib.h>

void test(int *root){
    printf("%d n", *root);
    *root+=1;
    if (*root>10)
        return;
    test(root);
    //printf("AMA n");
    test(root);
}

int main(){
    int var=0;
    test(&var);
}

the result of this program is:

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

why? i don’t understand Recursion in C,
if results save in storage and then showed?

I try some versions of Recursion but don’t full understand it.