In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Echocardiography demonstrates in clear, graphic fashion the _ cardiac chambers and four valves.

A: four
****
Q: Comets are a bit like giant dirty ice-balls with diameters between _ and fifty kilometres.

A: five
****
Q: Deer ticks carry all _ diseases.

A:
three
****