The focus of this course is on vertebrate animals, or those with a backbone.
Analogy is common function without regards to origin.
His physician father sent him off to Edinburgh to become a doctor, which was not his interest. He dropped out, and went to Cambridge to become a minister. After graduation, he went on the sailing ship Beagle at age 22 with Captain Robert FitzRoy. Up to that time Darwin had accepted special creation and the nonchanging status of species, along with the rest of European society. He had also read Lyell's Principles of Geology and later Malthus's Essay on the Principle of Population .