Selective Animal Breeding: Create a New Breed
Understand how parent selection and generation-by-generation selection produce a new animal breed.
Cell: Organelles and Transport
Explore organelles, membrane transport, and cell energy balance.
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.