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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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.
The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
![The rotifer, Brachionus calyciflorus, is a large predator that consumes the smaller algae, Chlorella](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_35_26_1970654.jpeg)
![Alligators are apex predators capable of killing large terrestrial prey. This large AAmerican alliga](https://biology-forums.com/gallery/47/medium_27759_23_04_12_8_20_47.jpeg)