Exam 2 Lecture 9

UIC BioS 101 Nyberg

19

Efficiency is not always increased by evolution

• Salamanders and other ‘cold blooded’ organisms are more efficient in converting the food they eat into biomass than are the ‘warm blooded’ birds and mammals, yet amphibians and reptiles have largely been replaced by mammals and birds in most ecosystems.

Speaker Notes:

19

Evolution does not necessarily increase all functions of systems.