World 3 · Hopping, Slithering, Swimming · 10 min · PRO
Staying neutral
The swim bladder
PRO · Animal Movers
World 3: Hopping, Slithering, Swimming is part of PRO
The first world of Animal Movers is free. PRO opens the other 20 lessons in 5 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly