AP essay questions - Biology Junction

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AP Biology - Free Essay Examples and Research Papers

Again, the dates for these events are rather rough, but if the creation of a chloroplast happened once and the creation of sexual reproduction happened once, then sexual reproduction would have needed to come before the chloroplast, as many plants produce sexually. If it turns out that the chloroplast really is 1.6 billion years old, then the current date for sexual reproduction would need to be pushed back, or the “sex was invented once” idea would have to be discarded, and biologists would probably decide that the date of sex appearing would need to be pushed back, even without fossil evidence of it.

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As smoke cleared and dust settled, literally, from the , the few surviving mammals and birds crept from their refuges, seeds and spores grew into plants, and the began, which is also called the Age of Mammals, as they have dominated this era. The Cenozoic’s first period is the , which ran from about 66 mya to 23 mya. As this essay enters the era of most interest to most humans, I will slice the timeline a little finer and use the concept of epochs. The Paleogene’s first epoch is called the (c. 66 to 56 mya).

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So far, this essay has dealt lightly with regional differences and largely confined the discussion to polar, temperate, and tropical conditions in the seas, and rainforest versus dryer conditions on land. While existed, barriers to species diffusion on land were relatively modest, hence dominance. But at the Triassic’s end, and continental differences in plants and animals often became significant in later times. Although the formation of Pangaea had profound impacts, because land life was relatively young, the differences and resultant changes due to the removal of oceanic barriers were less spectacular than would happen in the distant future, such as when .

AP Biology Essay Questions The following is a comprehensive list of essay questions that have been asked on past AP exams. The questions are organized according to units.

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Another evolutionary concept is that all changes had mechanical reasons for happening (again, today’s science has ), and each mechanical change required some purpose in improving an organism’s chances of surviving to reproduce, or at least not have unduly impaired it. As evolution progressed, for each species, it was like taking a road, and the farther down the road a species went in its development, the “lifestyle” opportunities that its biological operation created precluded other kinds of styles. For instance, trees will never become . Trees went down the path of roots, , growing taller than their neighbors, and the like. A plant cannot choose locomotion as a way of life. It does not generate enough energy for it, for one thing. Animals went down a very different evolutionary path than plants did, and muscles, brains, livers, and the like have no analogy in plants and, by themselves, plants will not grow muscles or brains anytime soon, although humans have been making radical changes in animals over brief periods of time, such as the many breeds of dog.