Step 1 : Introduction to the question "10. Which of the following would you expect to hatch out of an egg?"
...1. A platypus 2. A carnation 3. A calf 4. A piglet Calves and piglets are born in the usual mammalian fashion, and carnations grow from seed. A platypus is one of two mammals that really does hatch out of an egg. The echidna is the other one. The platypus and echidna are very primitive mammals known collectively as monotremes.