Which detail best conveys the author's perspective about the topic?
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"Ralph Metcalfe was known as the fastest human in the world"
"He won four Olympic medals: one gold medal, two silver medals, and one bronze medal."
"Between 1949 and 1952, he was the head of the Illinois State Athletic Commission."
"A rock to his fellow athletes, Metcalfe helped his teammates"
"A rock to his fellow athletes, Metcalfe helped his teammates"
Biologists have found that about 10 percent of animal species may sometimes breed with other species. This means that two animals of different species can produce offspring. Scientists have discovered more of these animals in the last 25 years. One example of a hybrid animal is the mule, which is a cross between a donkey and a horse.
It is more difficult for hybrid species to survive in the wild, however. Occasionally, species that are too different genetically might mate in nature. Many babies that come from the different species are unable to reproduce. This means that the hybrid species cannot grow in number. Zorses, which are a hybrid of a horse and a zebra, and mules, are two examples of species that cannot reproduce. Another problem that hybrid species have is that they face competition from the members of their parent species.
There are also positive things about producing hybrid species in the wild. Hybrids may develop adaptations to conditions that neither of their parents was able to live in. This could happen because of new gene combinations being produced in hybrids. Scientists have studied the adaptation of hybrid species using sunflower and honeysuckle plants.
Two common species of sunflower are the common sunflower and the prairie sunflower, and both species only grow in moist soil. Their hybrids can grow in desert climates and salt marshes, however. When parent sunflowers were planted in the desert, they failed to survive. Results of the studies done with plants are comparable to similar things that have happened in animals. The studies of animal and plant hybrids could help us discover how humans have adapted.
How does the author develop his or her point of view in the passage?
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by stating that studying animal and plant hybrids could help explain adaptation in humans
by describing the problems faced in producing hybrid animals and plants in the wild
by showing how hybrid species are forced to compete with their parent species for survival
by explaining how a lion needs to mate with a tiger in order to produce a liger
by stating that studying animal and plant hybrids could help explain adaptation in humans
What is the author's purpose in writing this passage?
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to describe the plants and animals of different hybrid species that can mate
to explain the meaning of hybrid species and their advantages and disadvantages
to discuss the possibilities of having more hybrid plants and animals in deserts
to explain the difficulties faced by hybrid plants and animals in surviving
to explain the meaning of hybrid species and their advantages and disadvantages
More teens in the U.S. suffer from mild hearing loss today than teens did 10 years ago. Scientists blame this increase among teens on the rise in popularity of using earphones to listen to MP3 players. A large number of teens report that they do not believe that they listen to music at a level loud enough to affect their hearing ability. Scientists counter that most teens do not realize that the volume of their MP3 players is loud enough to affect young ears.
What would be a better persuasive device for the author to use?
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naming the earphone brands that have caused the least amount of hearing loss among teens in the U.S.
listing the most popular brands of MP3 players that are used by teens in the U.S. today
giving the statistics of how many more teens in the U.S. are experiencing hearing loss today than teens did 10 years ago
presenting the total number of MP3 players sold to and used by teens in the U.S. over the last two years
presenting the total number of MP3 players sold to and used by teens in the U.S. over the last two years
The purpose of the ad below is to convince people to take their pet to Seaside Veterinarian. What technique does the author use to convey this?
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Captionless Image
playing on a reader's emotions
playing on a reader's insecurities
appealing to a reader's sense of patriotism
appealing to a reader's sense of style
playing on a reader's emotions
How does this sentence help to develop the argument that cycling to work is a better alternative to driving?
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It illustrates the frustrations of driving in traffic.
It shows how driving can make people gain weight.
It shows that many people cycle to work.
It illustrates the health benefits of cycling.