|
|
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
![Male coho salmon exhibit two alternative life history strategies. “Jackâ€ÂÂ](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_35_55_17931178.jpeg)
![During World War I, advancing armies unloosed ferocious artillery barrages to destroy deeply entrenc](https://biology-forums.com/gallery/47/medium_4_23_06_16_8_40_59_235972013.jpeg)