Similarities and differences: understanding homology and analogy (High School level) :
How do analogies evolve?
Often, two species face a similar problem or challenge. Evolution may then
shape both of them in similar ways resulting in analogous structures. For
example, imagine two flower species that are not closely related, but both
happen to be pollinated by the same species of bird. A flower that gets
pollinated produces many seeds and has a big advantage over flowers that
don't get pollinated.
If the bird prefers long red flowers, the flowers' shapes and colors may
evolve in ways that make them more attractive to the bird. The two flowers
might end up looking the same, even though they started out looking quite
different from one another. Click the button below to see how the two
flowers evolve over time.