Question

relationships among segmented animals
part b
click on the blank boxes and select a number from 1 to 4 to rank the animals
from most closely related (1) to least closely related (4) to the roaches, based
on the relationships shown on the cladogram.
ranking relatedness
segmented animal relative relatedness
to roaches
bristletails a
mayflies b
moths c
velvet worms d
what number would you put for the following?
a
b
c
d

Explanation:

In a cladogram, the closer the common ancestor, the more closely related the organisms. Roaches and beetles share a more recent common ancestor (wing sheaths) than with moths (coiled mouthparts). Mayflies share a common ancestor (wings) with roaches earlier than beetles. Bristletails share a common ancestor (exoskeletons) much earlier. Velvet worms are the out - group (segmented bodies is a very basal trait).

Answer:

A. 4, B. 2, C. 3, D. 1