The ancestors of modern saguaro cacti did not have long and sharp spines. Consider the first ancestor of saguaro cacti to grow spines that were as long and sharp as the spines on saguaro cacti living in Arizona today. Why did this cactus grow such sharp spines? ???a) It was fortunate a genetic mistake gave it extra sharp spinesb) The cactus needed sharper spines to stop animals from eating itc) Animals chewing on the cactus caused it to grow sharper spinesd) Mutations changed the DNA of this cacti because it was injured by an animal e) The hot climate caused this change

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