|
|
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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.
People about to have surgery must tell their health care providers about all supplements they take.
![In most ecosystems, sunlight provides the ultimate source of energy to power all biological activity](https://biology-forums.com/gallery/47/medium_33_17_02_12_6_59_59_20232401.jpeg)
![The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_24_31_20573922.jpeg)