B. an original research report
Answer:
Explanation:
More than 99 percent of all organisms that have ever lived on Earth are extinct. As new species evolve to fit ever changing ecological niches, older species fade away. But the rate of extinction is far from constant. At least a handful of times in the last 500 million years, 75 to more than 90 percent of all species on Earth have disappeared in a geological blink of an eye in catastrophes we call mass extinctions.
Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals and birds to rapidly diversify and evolve.
Answer: Parallel structure or parallelism is used when words are united by grammatical forms. The lack of a parallel structure can disrupt the rhythm of the sentence, where the sentence is grammatically unbalanced. The use of parallelism achives a good balance in sentence, alignment of related ideas, clarity and readability. By associating related ideas, the point of analysis is emphasized, the arguments are connected, easily visible and in this way the analysis is clear and easy to understand.
Explanation: Hope this help ;)
