1.) what are homologous structures in different species evidence of?
a. a common ancestor
b. natural selection against a trait
c. inheritance of acquired characteristics
d. similar adaptations to their environments
2.) what is a key part of darwin's idea of natural selection?
a. earth is really old
b. everything has a predator
c. organisms' characteristics are carried on dna
d. more individuals are born than can live on available resources
3.) which of these is the foundation for relative dating
a. earth is very old
b. deep rock strata are older
c. radioisotopes decay at a constant rate
d. organisms can be closely related to eachother