Describe the evidence for homology between an annelid worm's mouth and a rat's anus. Examine the clasping tendrils of Passiflora and the spines of Bouganvillea . These plants are not very closely related. Try to identify the anatomical point of origin of each structure and its relationships to other parts of the plant. Describe your ideas here.
Shells Consider the specimens and drawings of mollusks, brachiopods and barnacles.
Using the available reference, describe evidence that these are analogous features. Compare the figures illustrating mollusk eyes and the illustration of the human eye. Eyes function by focusing light onto a surface covered by photosensitive cells. Compare the orientation of pigment and sensory cells in the human and mollusk eyes, and trace the pathways by which the nerve fibers connect to the brain. Describe what evidence you could gather to support your answer.