Convergence vs. natural selection
Article on the website of the National Center for Science Education.
Video by Jackson Wheat, looking at why convergent evolution happens and how different lineages evolve similarly but differently to solve similar problems.
The Evolution of Creation Science, Part 3: Natural Selection and Convergent Evolution
Article by Philip J. Senter in the journal Perspectives on Science and Christian Faith. Appendix 1 briefly addresses a number of specific claims of irreducible complexity. The full issue in which this article appears is also available.
Claim CB211: An antigen receptor protein structure is same in camels and sharks
Brief response in the Index to Creationist Claims in the TalkOrigins Archive.