Nephridia are the tubular excretory structures of earthworms (annelids) , and Malpighian tubules are the excretory structures of insects like cockroaches ; therefore, this pair is correctly matched. In contrast, the thorns of Bougainvillea and tendrils of Cucurbita are homologous organs (divergent evolution) , and the wings of insects (honey bee) and birds (crow) are analogous organs (convergent evolution) .