Earths magnetic field helps protect Earth and its organisms. It protects us from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles. This is where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole. Knowing this helps them tell direction. Many animals have natural 'compasses' that work just as well. Birds like the garden warbler in Figure 1.36 use Earths magnetic field. They use it to guide their annual migrations. Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern.

Question: "What is the purpose of a compass and what does it detect?"

Answer: "To detect center of gravity"

Response: no

Magnetism is the ability of a material to be attracted by a magnet. It also include the ability for some material to act like a magnet. No doubt youve handled refrigerator magnets. You can see some in Figure 1.28. You probably know they stick to a metal refrigerator. This is what holds your homework up. Maybe your little sisters drawings are hung on the fridge in this manner. Do magnets stick to all materials? Of course not. You have probably checked and they do not stick to other surfaces. They do not stick to wooden doors or glass windows. Wood and glass are not attracted to a magnet. Obviously, only certain materials are attracted to magnets.

Question: "What is magnetism?"

Answer: "Your little sisters drawings"

Response: no

Relying on an animal to come by is risky. A flower may have to wait a long time for the right animals to come by. What if one never passes close enough to the flower? Hoping the wind will blow is also risky for a plant. What if the wind does not blow? What if the blowing pollen does not land on another flower? The wind could even blow the pollen over the ocean where it is wasted. Giving free nectar is costly. It is not a good use of the plants energy. A plant uses a lot of energy to produce nectar. Some animals may just drink the nectar. They may not carry off any pollen in return. To improve their chances, plants evolved special traits. For example, they developed ways to hide their nectar. Only certain animals were able to get at the plants hidden nectar. These specific animals might be more likely to visit only flowers of the same species. This was also a benefit for some animals. Animals also evolved special traits to get to the nectar.

Question: "Why is giving free nectar costly?"

Answer: "It is not a good use of the plants energy"

Response: yes

MALS was formed here more than 30 years ago. Today, 14 staff attorneys, 26 office workers and 21 University of Memphis third- year law students work out of rented offices in the old Claridge Hotel building at 109 N. Main. Offices are spartan. There are no lush rugs or stylish furniture. The large table in the conference room is simple varnished wood. Offices are small and mostly plain, except for the eclectic mix of pop art, African statuary and neon that adorns litigation director Webb Brewer's space. Brewer, who has been at the agency 20 years, said there is a need for lawyers of all stripes to help with the problems of the poor. "The private bar could meet more of the need through pro bono work, but there are still cases that involve the systemic problems for low-income people that we would need to do," said Brewer. "The legal system marketplace just doesn't serve low-income people too well, except in fee-generat-ing type cases," Brewer said. "If a poor person gets run over by a bus, an attorney might take that case because they might be able to recover part of the damage award as attorney fees. But so many of the cases we handle have to do with basic rights and a decent life. There is just no profit motive." Larry Pivnick, law professor at the University of Memphis Law School and director of political programs at MALS, said Legal Services is a great learning laboratory for law students. "There are thousands and thousands of people who have problems that never get an opportunity to appear in court," Pivnick said. "Some people may not be particularly articulate. Courts have rules that clients don't always understand." Brewer said a major focus of the agency's work involves housing. "Although a lot of our work is grant-driven, we find that the lack of safe and decent affordable housing and the prevalence of predatory lending are the biggest problems in our client population," Brewer said, referring to clients such as James.

Question: "Who is Larry Pivnick?"

Answer: "Law proffessor at University of Memphis law"

Response:
yes