What's the meaning of this sentence? The physical extraction and/or concentration of collagen usually involves particle size reduction of collagen - or high-collagen materials - by cutting, grinding, flaking, milling or a combination of these. I do not understand this part : particle size reduction of collagen- or high-collagen materials -

what's the difference between health and wellness?

In twenty years there will be fewer cars in use than there are today. This is a TOEFL writing question. Do you agree or disagree with following statement? In twenty years there will be fewer cars in use than there are today. Use specific reasons and examples to support your answer. Nowadays, more and more people have their own car. Twenty years ago, we can not see as many car as now, but along with the development of technology, having a car is a usual thing for most families. Because of big numbers of private cars, in our city, government announced that they promulgated to control the traffic. A lot of people are worried about if the number of cars will increase. But in my personal opinion, I believe that in the future, there will be fewer cars than today for the following reasons. First of all, a lot of people noticed that environment pollution is much serious than before. And one of the main reasons is the smoke coming from the cars which lead to air pollution. Some scientists said that the result of global-warming is earth goes to the ends. For this, most people are cautious that they should protect our home and our environment. So they will lessen to utilize car even buying a new one. Furthermore, because of the technical development, people need not to move as more as before. Even now, there are a lot of people who work at home. My older sister is an office worker before, she is leaving home very early and arrived home very late. But recently, she changed her job as a home-based online tutor. She told me that she does not need her car anymore because she need not to go out everyday. And several days ago, she sold her car. What’s more, maybe in twenty years, we will use other vehicle instead of car. In my country, twenty years ago, there are not so many people having car. The most popular vehicle is bicycle. And nobody thought that car will become a public transportation for the people. And recently, a lot of young people start to use a transportation tool which call E-scooter. It is much smaller than a car, and do no need to use gasoline anymore. And the biggest advantage is that it is easy to take it out. The users said that car is not a utility anymore for them. To summarize, not only for environment, but also according to the development of the society and the technology, the number of car will be fewer than there are now.

It is more important to keep your old friends than it is to make new friends This is a TOEFL writing question. Do you agree or disagree with following statement? It is more important to keep your old friends than it is to make new friends. Use specific reasons and examples to support your answer. Most people think that they should concentrate more on how to keep their old friends. Because they believe on the saying in our country which is old thing is a root of our life, we can not forget our root. Although, they are not communicating with their old friends as friends any more, they are still forced themselves to keep the relationships. But in my personal opinion, I think making new friends is more important than keeping old friends for the following reasons. First of all, while we are growing, we get more informations than before, we do not have common topics with old friends any more. In that situation, we need to meet new friends that we have the same hobbies or have same viewpoint with us. For example, one of my friends consist her thought that she keeps with old friends, but her friends do not like that. They make new friends and hang out with new friends. Now they do not want to hang with my friend any more because they think there are not common topic among them any more. Furthermore, we can learn new things from new friends. My older brother keeps making new friends until now. He has a lot of friends. Before his dream is to become a policemen. One of his friends suggested that he can learn a foreign language. Suddenly he noticed that English language is his new hobby. That is why he became an English teacher. What’s more, making new friends can give you an exciting free time. If we just focus on keeping old friends, it means the number of friends is limited. I like lively settings more than silent ones. If I have a lot of new friends, the atmosphere on my birthday party will be exciting. All of the above, I think making new friends is much better than only keeping old friends because it can make our lives more interesting, we can learn more things, and will have an exciting environment. When we are happy, our life is perfect.