If your explanations demonstrate good knowledge of the material, you will get half the points you missed. You must attach a copy of the quiz with the extra-credit submission. You may correct any or all of your quizzes, but the submissions must be turned in to Professor Todd before the beginning of finals week. Succession may be degradative, constructive, or cyclic. The degree of biological diversity results from the difference between rates of speciation and extinction.
Diversity tends to be greatest at low latitudes and low elevations.
Habitat heterogeneity and productivity tend to increase biological diversity. Speciation may result from geographic isolation of populations. Life has existed on Earth virtually from its origin. Prokaryotes have dominated the Earth throughout its history. Eukaryotes have occupied the planet only during the latter half of its existence.