Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
what is the sport when the age group is 21 or younger and the competition name is world youth netball championships?

### Inputs:
table_name: table, columns: ['Sport', 'Competition name', 'Competing entities', 'Age groups', 'Held every']

### Response:
SELECT Sport FROM table WHERE Age groups = 21 or younger AND Competition name = world youth netball championships