These passages natural?

At school I take English class, studying a English reader book. But since the reader is bilingual, I doubt whether or not it is written by native speakers. So, could you please read the passages below from the reader, and tell me whether they are natural or they seem to be written by a native speaker?

1. Ara worked on the field that day, and her husband, Urgh, had departed several days before to go hunting with some adults in the clan. Her baby stirred and started to cry. She knew that his crying was not because the little one was hungry, but because of the loud roaring in the sky. She hoped that Urgh would be able to come back before a furious storm would break out. As things became darker and the winds were gaining strength, she heard the sounds of the returning hunting party and rushed out of the hunt. Her husband was with the leading males, a small animal dangling around his shoulders. He greeted Ara by hugging her. When looking him in the eyes, she realized that the days of hunting had been successful.

2. Reaching beyond realism, the naturalists tried to illustrate as faithfully as possible whatever was observable to them within their literary works. They wanted to reveal the dominant states of things in all areas of life. While the realists tried to evoke the impression that the characters really exist and that the events narrated are the events of ordinary experience, the naturalists wanted to give a strictly objective depiction of the struggle against nature as a hopeless fight, believing that human behavior is determined by the environment. The reason for this shift to the fundamental idea or realism was the visible decline of the living conditions of the lower classes in the 19th century. Large cities became the focus of literature due to miserable housing conditions, factories, diseases, and widespread hunger.

3. Each year the HR Advertising Company in North America presents their top performers with Dream Awards. As most conpanies do, HR uses objective performance criteria to determine who should receive these awards. What makes their approach so different, and so powerful, is that each winner receives a unique award. During the year, the company sends out a survey to every employee asking them to identify what prize they would like to receive if they should win. The prize value is capped at $10,000, and it cannot be changed into cash, but other than these two restrictions, each employee is free to pick whatever prize he wants. Then, at the end of the year, after the winners have been identified by their performance, HR cross-references each winner to the prize he identified, shoots a video explaining why he won and why he selected the particular prize, and, in the big Dream Awards ceremony, plays the video and awards the prize.
You can imagine the impact of these personalized prizes. It's a typical thing to be brought up on stage and give yet another plaque and trophy. However, it's a different thing entirely when, in addition to public recognition of your performance, you receive college tuitionfor your child or your new kitchen or a fancy motorcycle you've always dreamed of. The airline tickets to fly one winner and his family back to Mexico last year to visit the grandmother he hasn't seen in then years are the prize everyone at the company still talks about.

4. One remarkable discovery emerging from science is that we are not cut off from the rest of the universe. A core theme throughout this book is the idea that we each have a natural bond with the cosmos, even though it may be largely unrecognized and undeveloped. The respected author and researcher Dean Radin did an exhaustive analysis of psi research ( * 'psi research' is not a mistyping) involving more than eight hundred studies and sixty investigators over nearly three decades. After weighing the collective evidence from all these studies, he concluded that we do participate in a subtle field of consciousness where we can both "send" and "receive" These results are borne out in people's everyday experience. For example, surveys of the American adult population such as an accurate intuition about the well-being of someone who is far away. In addition, about 40 percent report having had a "mysterical" experience such as seeing the universe as alive and feeling a sense of great peace and safety within that aliveness. In keeping with these findings, a recurring theme of this book is that consciousness is not confined within the brain but is an infusing presence throughout the universe that enables us, in cooperation with the brain, to connect meaningfully with the world beyond our physical body.

5. Given the growing human population, it is difficult to imagine a complete stop to habitat destruction. However, biologist Norman Myers and his collaborators have concoluded that twenty-five biodiversity "hotspots," making up less than two percent of Earth's surface, contain up to fifty percent of all mammal, bird, reptile, amphibian, and plant species. Hotspots occur in areas of the glovbe where favorable climate conditions lead to high levels of plant production, such as rain forest, and where geological factors have resulted in the isolation of species groups, allowing them to diversify. Stopping habitat destruction in these hotspots could greatly reduce the global extinction rate. Of course, preserving these biodiversity hotspots is not easy, but by focusing conservation efforts on hotspot areas at the greatest risk, humans can very quickly prevent the loss of a large number of species.

6. We are deeply ambivalent about children. our attitudes to children are rooted more often in myth rather than in reality. At one moment we see children as innocents and guard them from every real or imagined danger; at the next moment we treat youngsters as monsters from whom society needs protection. Such attitudes serve both children and society baldy. Only those with no recollection of the childhood cruelties of the playground or the sports changing room can entertain the illusion that children are unspoiled by the rougher ways of the world. The attempts to protect children from every source of harm or danger will create a generation of young people incapable of looking after themselves. Society needs to be actively concerned with fostering children's capacity to look out for themselves.