Life Science Exam.

A not necessarily well-prepared student sat in his life science classroom, staring at a question on the final exampaper.

The question directed: "Give four advantages of breast milk."

What to write? He sighed, and began to scribble whatever came into his
head, hoping for the best:

1. No need to heat.
2. Never goes sour.
3. Available whenever necessary.

So far so good. But the exam demanded a fourth answer. Again, what to write? Once more, he sighed. He frowned. He scowled, then sighed again. Suddenly, he brightened.

He grabbed his pen,and triumphantly, he scribbled his definitive answer:

4. Available in attractive containers of varying sizes