#Question id: 4613
#Section 2: Evolution
The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change. Which species is most closely related to species W?
#Question id: 4614
#Section 2: Evolution
Which of these is the extant (that is, living) species most closely related to species X?
#Question id: 4615
#Section 2: Evolution
Currently, two of the living elephant species (X and Y) are placed in the genus Loxodonta, and a third surviving species (Z) is placed in the genus Elephas. Assuming this classification reflects evolutionary relatedness, which of the following is the most accurate phylogenetic tree?
#Question id: 4616
#Section 2: Evolution
Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
#Question id: 4617
#Section 2: Evolution
Which of the following is not an observation or inference on which natural selection is based?
#Question id: 4618
#Section 2: Evolution
Which of the following observations helped Darwin shape his concept of descent with modification?