Underdeveloped sorry if I’m wrong
Answer:
Birds’ feathers are designed to be light but very strong, flexible but very tough. Although it looks like feathers grow all over a bird, they actually grow in specific areas called feather tracks. In between the feather tracks are down feathers. This keeps the body weight down.
Feathers are made of a tough and flexible material called keratin. The spine down the middle, called the shaft, is hollow. The vanes are on the two halves of the feather. They are made of thousands of branches called barbs. Because there are many spaces between these barbs, a feather has as much air as matter.
Explanation:
I believe the answer is: <span>be difficult to assure that the use of information gathered would do no harm
Anthropology studies the cultures and habbits that exist in a certain society and make a conclusion based on their observation.
There are a lot of cases when the conclusion of their observation is wrong and could ignite conflicts between different social groups. To prevent such things from happening, the rule above was created.</span>
Answer: B) Rachel will have less fatigue and fewer colds than will Leah.
Explanation: According to scientific studies, long-term stress and pessimism are linked, so that pessimistic persons like Leah, who always see the worst, accumulate stress. On the other hand, it has also been scientifically proven that stress is a trigger for many organic diseases, including serious illnesses, and of course colds and pain in the body, head, shoulders, etc. Stress affects the immune system, so logically, pessimistic people are more susceptible to stress, and therefore colds, diseases, etc.
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