11 new pages in Questions at the end of the chapter: don't miss the useful ones

Stuck on Questions at the end of the chapter? We added 11 fresh pages so students can revise without hunting across the site.

New in this section:

• Question 11 — Stronger response on second exposure
• Question 10 — Diseases from contaminated water
• Question 9 — No antibiotic for a viral infection
• Question 8 — Messages for a health campaign
• and 7 more fresh pages

Open it while it is fresh. Share it with someone revising the same chapter.