State two features that are found only in mammals.
a. hair/fur
Do not award marks for any answers after the first two given.
Birds, bats and humans are all vertebrates with pentadactyl limbs. Birds and bats use their forelimbs to fly whereas humans can use them to lift and manipulate objects. Outline how the bird, bat and human forelimb can be used to illustrate the concept of homologous structures.
a. (homologous structures have evolved) from a common ancestor
Do not accept (positive) correlation.
