|
|
Excessive alcohol use costs the country approximately $235 billion every year.
The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
![(A) Bronchopneumonia with localized pattern. (B) Lobar pneumonia with a diffuse pattern within the l](https://biology-forums.com/gallery/47/medium_14755_05_10_12_4_11_18_9269446.jpeg)
![The Sleep/Waking Flip-Flop According to Saper et al. (2001), the major sleep-promoting region (the v](https://biology-forums.com/gallery/47/medium_334766_23_04_15_12_38_58_21472871.jpeg)