12 labs that run in a browser. Students change one thing, collect numbers, and explain what happened. I build them for my own classes and share them here.
Ecology: how species and populations affect each other. 4 labs.
Predation, mutualism, parasitism, competition
Take one species away and watch what happens to the other. Five real pairs, mystery pairs to classify, and three warblers sharing one spruce.
16 questions · one class period · HS-LS2-1, HS-LS2-2, HS-LS2-6
Keystone species, field sampling
Count urchins and kelp in quadrats on two Aleutian islands the way Jim Estes did, then model a coast with and without otters.
16 questions · one class period · HS-LS2-1, HS-LS2-2, HS-LS2-6
Primary and secondary succession
Fast-forward bare rock and an empty city lot through hundreds of years, disturb three ecosystems, and read real plant data from Mount St. Helens.
16 questions · one class period · HS-LS2-1, HS-LS2-2, HS-LS2-6
Carrying capacity, limiting factors, survivorship
Grow duckweed on a pond, watch the reindeer of St. Matthew Island boom and crash, test trout in tanks of different pH, and follow 1,000 newborns.
16 questions · one class period · HS-LS2-1, HS-LS2-2, HS-LS2-6
The skin and the skeleton. 4 labs.
Integumentary system: parts and functions
Find every part of a slice of skin, map how finely different places feel touch, and run a runner through dry and humid air to see how sweat cools.
14 questions · one class period · HS-LS1-1, HS-LS1-2, HS-LS1-3
Epidermis, dermis and subcutaneous layer
Put thin and thick skin under a virtual microscope, measure each layer with an eyepiece scale, and test how deep an injury has to go to bleed.
20 questions · two class periods · HS-LS1-1, HS-LS1-2, HS-LS1-3
Accessory structures of the skin
Grow a hair through its whole cycle, grow out a fingernail, compare hairs like a forensic scientist, and run a sweat-print test.
20 questions · two class periods · HS-LS1-1, HS-LS1-2, HS-LS1-3
Skeletal system: 206 bones
All 206 bones of an adult in 3D. Turn it, take it apart, sort the bones by shape or region, and quiz yourself on every one.
14 questions · one class period · HS-LS1-2
Atoms, light and bonding. 3 labs.
Ionic bonding, conservation of mass, limiting reactant
Burn sodium in chlorine on a balance, the demo most schools can no longer do. Watch one electron jump, build other salts, and test all three substances.
14 questions · one class period · HS-PS1-1, HS-PS1-2, HS-PS1-3, HS-PS1-4, HS-PS1-7
Emission spectra, the Bohr model
Light up tubes of eleven gases, put on spectroscope glasses, zoom in to a single hydrogen atom, and identify a mystery gas from its lines.
16 questions · one class period · HS-PS1-1, HS-PS4-4, HS-ESS1-2
Periodic table, atomic models
An interactive periodic table. Pick any element to see a real sample, then see its atom eight ways, from Bohr to the electron cloud.
Reference tool, no worksheet
Periodic trends
Every element is a tower. Switch the height between atomic radius, ionization energy, electronegativity and five more, hide the d or f block, or wrap the table into a drum.
Reference tool, no worksheet
The keys stay off this site so students cannot find them. Teachers, email rsajdak@buffaloschools.org from your school address and I will send them.
Each teacher guide lists the NGSS performance expectations, science practices and crosscutting concepts for every part of the lab. New York's standards (NYSSLS) use the same codes.
Edit the worksheets to fit your class. If one of these works for your students, or breaks, I would like to hear about it.
© 2026 Ryan Sajdak. The labs, worksheets and slides are free to use, share and change under the Creative Commons BY-NC-SA 4.0 license: give credit, do not sell them, and share your version the same way. Photos and 3D models made by other people keep their own licenses.
