Circadian rhythms allow organisms to anticipate and prepare for precise and regular environmental changes. They thus enable organisms to best capitalize on environmental resources (e.g. light and food) compared to those that cannot predict such availability. It has therefore been suggested that circadian rhythms put organisms at a selective advantage in evolutionary terms. However, rhythmicity appears to be as important in regulating and coordinating internal metabolic processes, as in coordinating with the environment. This is suggested by the maintenance (heritability) of circadian rhythms in fruit flies after several hundred generations in constant laboratory conditions, as well as in creatures in constant darkness in the wild, and by the experimental elimination of behavioral, but not physiological, circadian rhythms in quail. 

Norwegian researchers at the University of Tromsø have shown that some Arctic animals (ptarmigan, reindeer) show circadian rhythms only in the parts of the year that have daily sunrises and sunsets. In one study of reindeer, animals at 70 degrees North showed circadian rhythms in the autumn, winter and spring, but not in the summer. Reindeer on Svalbard at 78 degrees North showed such rhythms only in autumn and spring. The researchers suspect that other Arctic animals as well may not show circadian rhythms in the constant light of summer and the constant dark of winter. What are the answers to this following set of questions: 1. What are light and food categorized as?
2. What kind?
3. Do certain rhythms let living things prepare for things?
4. What kind?
5. What do they generally prepare for?
6. What sort?
7. Are these changes sporadic?
8. How are they described?
9. What is the nationality of scientists at the University?
10. What university?
11. What many examples of arctic animals are given?
12. What is the first one?
13. And the second one?
14. Do these animals display circadian rhythms?
15. In what times of the year?
16. What season was not mentioned as one in which an animal at 70 degrees North displays rhythms?
17. How many seasons did the animal on Svalbard at 78 display rhythms?
18. What is the first one mentioned?
19. And the second one?
20. What allows living things to make the best of resources of the environment?
Answer: 1. Resources
2. Environmental
3. Yes
4. Circadian
5. Changes
6. Environmental
7. No
8. Regular
9. Norwegian
10. University of Tromsø
11. Two
12. Ptarmigan
13. Reindeer
14. Yes
15. Parts that have daily sunrises and sunsets
16. Summer
17. Two
18. Autumn
19. Spring
20. Circadian rhythms

(CNN) -- At least one person was killed when a National Guard helicopter crashed in waters off San Juan, Puerto Rico, a Federal Aviation Administration spokeswoman said Tuesday, citing preliminary information. 

"The preliminary information we have ... is that the wreckage of (the) Army National Guard aircraft was found in the water near San Juan," spokeswoman Diane Spitaliere said in an e-mail. 

The aircraft was destroyed, she said. 

The crash occurred late Monday, according to Lt. Cmdr. Matthew Moorlag of the U.S. Coast Guard in Miami, Florida. 

The Coast Guard received the call to help late Monday night with search and rescue efforts, said Ricardo Castrodad, spokesman for the Coast Guard in San Juan. He said three crew members and three passengers -- one guard and two civilians from Puerto Rico -- were on board. 

The UH 72 Lakota helicopter departed Monday night from San Juan, he said. It was one nautical mile northeast from the Puerto Rican coast. 

Castrodad did not provide information on casualties but said the search for survivors was ongoing. 

CNN's Mike Ahlers and Maria P. White contributed to this report. 

 What are the answers to this following set of questions: 1. What sort of crash happened?
2. Who owned it?
3. Where did it happen?
4. Was anyone hurt?
5. How badly?
6. Did the vehicle get totaled?
7. When did this happen?
8. What date was that?
9. Was there a spokesperson for the accident?
10. What is their name?
11. How did she communicate?
12. Did another agency assist?
13. Who?
14. Did they have a spokesperson?
15. How many from that agency helped?
16. Is the effort to recover victims still going on?
17. Is all this info finalized?
18. What was the model of the vehicle that was totaled?
19. How far away from land did they find it?
20. Who reported on this?
Answer: 1. helicopter
2. the National Guard
3. San Juan, Puerto Rico
4. yes
5. they were killed
6. yes
7. Monday
8. unknown
9. yes
10. Diane Spitaliere
11. by e-mail
12. yes
13. The Coast Guard
14. Ricardo Castrodad
15. unknown
16. yes
17. unknown
18. The UH 72 Lakota helicopter
19. one nautical mile
20. CNN

(CNN) -- A Michigan teenager pleaded guilty Monday in the mob beating of a 54-year-old grandfather after he inadvertently struck a child with his truck in April, according to a news release from the Wayne County Prosecutor's office. 

Bruce Wimbush, 18, pleaded guilty to assault with intent to do great bodily harm, according to the news release. 

Wimbush admitted in court Monday that he punched the driver, Steven Utash, in the jaw and was among a "large group of people" that attacked the man in April. The teen told Judge James Callahan that after seeing Utash hit a child, he "got emotional" and his anger took over, according to CNN affiliate WDIV. 

"I have a little brother and when I saw the kid, all I could see at the time was my little brother," Wimbush said, according to WDIV. 

The charge was reduced by prosecutors from assault with intent to murder with the agreement that Wimbush will testify in future proceedings related to the assault, the release said. 

Three other adult suspects are charged with attempted murder in the attack while a fourth, a juvenile, is charged with assault and ethnic intimidation. They are scheduled to appear in court this week, according to the prosecutor's office. 

Wimbush will be sentenced on July 7 and faces up to 10 years in prison, according to the prosecutor's office. 

Utash, the driver, was hospitalized in a coma after the attack. He returned home in May after spending more than six weeks in a hospital and rehabilitation center, according to a "Help Steven Utash" Facebook page post.  What are the answers to this following set of questions: 1. Who is the Michigan Teen?
2. How old is he?
3. What did he plead guilty to?
4. WHo did he attack?
5. Was Wimbush alone?
6. How many others were charged?
7. When will Wimbush be sentenced?
8. How many years does he face?
9. Why did wimbush attack the 54 year old?
10. What is the victims name?
11. Was he ok right after?
12. what happened to him?
13. how long before he was able to leave?
Answer:
1. Bruce Wimbush
2. , 18
3. to assault
4. a 54-year-old grandfather
5. no
6. Three
7. on July 7
8. up to 10 years
9. he  struck a child with his truck
10. Utash
11. no
12. he was hospitalized in a coma
13. six weeks