Read the following. How would Lamarck explain these facts? How would Darwin explain these facts?

Question

A barren island without trees or shrubs is covered with rocks and low-growing grasses. A strong and steady breeze sweeps across the island all of the time and it blows out to sea. On the island lives a peculiar beetle without wings. Where wings should be has little stubs that are of no use for flying. In fact, these beetles never attempt to fly. They stay close to the ground where the rocks and grasses provide some protection against the wind. This island lies about 1/2 mile off the mainland.

The mainland, which is heavily wooded, has many trees and shrubs that break the force of the wind. The identical beetle lives on the mainland. There is one major difference- the mainland beetles have wings of normal size and move about freely in the protected environment.

Answer 1

Lamarck would say that the loss of wings was an acquired characteristic. Wings would get you killed, so give them up!
Darwin would say that some beetles progeny have no wings and some do have wings. Only the progeny that do not have wings can survive on the windblown island, so none of the winged beetles survived. Only the wingless beetles are producing progeny now. Perhaps some of the wingless beetles produce progeny with wings, but when they mature, they fly, and are carried away by the wind, leaving only wingless progeny behind. If the wind stops, perhaps the island would again be populated by both kinds of beetles, from either the mainland or from the few progeny that are born to the wingless beetles.

;-D This is micro evolution, or, changes within a species due to environment, breeding and survival.