Play · Grades 6–12 · Adults · about 4 min
🔢 Over/Under
Twelve numbers from the species profiles and the tools. Guess whether the real figure is over or under the line, then see it.
Question 1 of 12Score 0
Years a Japanese knotweed rhizome fragment can regrow from: over or under 5 years dormant?
Keyboard: 1–2 to answer, Enter for next.
Figures are from the sources linked on each species profile; population counts are the best published estimates.