Wrinkles
Skin wrinkles are caused by a variety of factors. Some of these factors are intrinsic, meaning that you cannot control them because they occur naturally. Others are extrinsic, meaning that they are caused by circumstances outside of the body.
One intrinsic factor is aging. As you age, your skin loses collagen, which is the protein responsible for keeping your skin elastic. With less collagen, your skin becomes thinner and more fragile. Aging also reduces the functioning of sweat and oil glands, which work to keep the skin looking smooth. You also lose fat in the deeper layers of your skin as you age. This fat loss causes your skin to sag and develop deeper wrinkles.
The two most common extrinsic factors are exposure to ultraviolet radiation (UV rays) and smoking. UV rays in sunlight break down your skin's connective tissue and collagen fibers. To prevent the appearance of wrinkles (as well as protect yourself from skin cancer), you should always use UV-blocking sunscreen. The nicotine in cigarettes is the most likely link between smoking and wrinkles. Nicotine narrows the blood vessels, reducing the blood supply to your skin tissue. This deprives your skin of oxygen and important nutrients, causing damage that contributes to wrinkles.
Question: What is the best summary of the passage?

Question

Wrinkles
Skin wrinkles are caused by a variety of factors. Some of these factors are intrinsic, meaning that you cannot control them because they occur naturally. Others are extrinsic, meaning that they are caused by circumstances outside of the body.
One intrinsic factor is aging. As you age, your skin loses collagen, which is the protein responsible for keeping your skin elastic. With less collagen, your skin becomes thinner and more fragile. Aging also reduces the functioning of sweat and oil glands, which work to keep the skin looking smooth. You also lose fat in the deeper layers of your skin as you age. This fat loss causes your skin to sag and develop deeper wrinkles.
The two most common extrinsic factors are exposure to ultraviolet radiation (UV rays) and smoking. UV rays in sunlight break down your skin's connective tissue and collagen fibers. To prevent the appearance of wrinkles (as well as protect yourself from skin cancer), you should always use UV-blocking sunscreen. The nicotine in cigarettes is the most likely link between smoking and wrinkles. Nicotine narrows the blood vessels, reducing the blood supply to your skin tissue. This deprives your skin of oxygen and important nutrients, causing damage that contributes to wrinkles.
Question: What is the best summary of the passage?

Quizplus · Accepted Answer

This summary hits the main points described in the passage without giving too many details regarding the scientific processes explained.
There is no way to combat the aging process, which will undoubtedly cause wrinkles is incorrect as the text does not include information regarding the impossibility of combating the aging process, although it does state that skin loses collagen as one ages, which eventually leads to wrinkles.
It is best to limit exposure to the sun and nicotine in order to prevent wrinkles is incorrect. Although the author makes a point to provide a suggestion regarding the use of UV-blocking sunscreen, this is a supporting detail and would not be the best summary.
One could suggest that it is easier to prevent against aging due to extrinsic factors rather than intrinsic factors is incorrect. The text does not include references as to which factor is more difficult to deal with. Paragraph 3 does allude to the fact that preventative measures can be taken in some cases, but that does not make this summary correct, nor is it the best option.

Wrinkles Skin Wrinkles Are Caused by a Variety of Factors. Some