the young of monotremes are 
hatched babies fertile warm white older than their parents born without a backbone always stillborn
A B C D E F G H
When the egg is ready to hatch, it hatches.
the young of monotremes are hatched 
the young of monotremes are  (A) hatched (B) babies (C) fertile (D) warm (E) white (F) older than their parents (G) born without a backbone (H) always stillborn