Zoologists Used to Refer to Animals as "Simple" and "Advanced

Multiple Choice

Zoologists used to refer to animals as "simple" and "advanced." Now it is more scientifically accurate to use

A) "simple" and "complex," since it is the complexity that evolved.
B) "allopatric" and "sympatric," since the reproductive isolation of the species is most important.
C) "evolved" and "un-evolved," since everything ties together with evolution.
D) "ancestral" and "derived," since some early forms became very complex and some highly evolved forms are derived from them but lost complex characters and secondarily became more "simple".