Biology B Practice Exam | 573 Questions| With Complete Solutions

EVOLUTION OF LIFE Darwin's Theory: 100% What is natural selection? a process that selects variations that help with survival and that spreads the variations to more offspring a process through which nature selects an individual within a population for extinction a process that causes all populations to gradually increase in size a process that causes random variations to appear in the offspring of every generation correct answer: a process that selects variations that help with survival and that spreads the variations to more offspring Which was Charles Darwin's contribution to the study of biology? He was the first person to recognize that organisms change over time. He believed that organisms adapted through the inheritance of acquired traits. He explained how traits are passed from parents to offspring. He proposed that natural selection is the primary mechanism of evolution. correct answer: He proposed that natural selection is the primary mechanism of evolution. During a trip to the Galapagos Islands, which observation led Charles Darwin to suspect that organisms change over time? Island finches were able to breed with mainland species. Island finches resembled mainland finches, but were not the same species. Island finches resembled extinct species from other islands around the world. Island finches did not have beaks of the same size and shape. correct answer: Island finches resembled mainland finches, but were not the same species. Which statement would least likely be used to describe variation? Variations are inherited differences between individuals of the same species. Variations that decrease reproductive success are more likely to be passed on. Variations may result in changes to an entire population after many generations. Variations provide some individuals with an advantage. correct answer: Variations that decrease reproductive success are more likely to be passed on. Scientific investigations often lead to the formulation of new scientific questions. The observations Charles Darwin's work after he returned home from his voyage and studying the selective breeding of pigeons prompted him to ask which question?