Photosynthesis is the answer
Bubbles are Carbon Dioxide
Oxegyn in the tank
Sorry you've waited so long for an answer! I belive the type of learning associated with a crow vending machine is trial and error! So sorry once again!
Answer:
Im confused with the last 3 but here is the answer to the first one
1-In the natural world, limiting factors like the availability of food, water, shelter and space can change animal and plant populations. Other limiting factors, like competition for resources, predation and disease can also impact populations.
