Selective Animal Breeding: Create a New Breed
Understand how parent selection and generation-by-generation selection produce a new animal breed.
Photosynthesis: Limiting Factors
Explore how light, CO₂, water, and temperature constrain photosynthesis rate.
All Simulations
Blood Circulation: Heart, Loops, and Oxygen
Trace pulmonary and systemic loops, oxygen saturation, and how activity changes heart rate and flow.
Breathing and Gas Exchange: How the Body Gets Oxygen
Follow air to the alveoli, track O₂/CO₂ exchange with blood, and compare rest vs load breathing.