Galapogos tortoises have a number of shell variations, shown right. What are the advantages of choosing a system examining the beaks of finches instead of the shells of tortoises? Check all that apply.
A
Birds have shorter lifespans, making generations shorter.B
The bird population is likely much greater, allowing for more data.C
Tortoises move too slowly for natural selection to influence shell phenotype.D
Birds are easier to track and monitor.