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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
The longest a person has survived after a heart transplant is 24 years.
Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
![The Koala does not normally need to drink, because it can obtain all of the moisture it needs by eat](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_32_07.jpeg)
![C, A nurse can also administer the medication by setting the dose and rate with an electronic infusi](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_35_15.jpeg)