Practise IB Biology SL C3.1 by tracing reflex pathways and explaining feedback control of ventilation, heart rate and body responses.
The diagram shows a biofilm that has formed on a tooth.
Using the diagram, explain the concept of emergent properties of biofilms.
Why do multicellular organisms have emergent properties?
They have more genes than unicellular organisms.
Properties of unicellular organisms are enhanced by having many cells.
All of their genes are expressed whereas unicellular organisms express only some.
They show properties that can only result from the interaction of many cells.
Draw a labelled diagram showing the interconnections between the liver, gall bladder, pancreas and small intestine.
