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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.
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.
Medication errors are more common among seriously ill patients than with those with minor conditions.
Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
![This lithograph by Currier and Ives gives an erroneous impression of the “battle.” Major Robert Ande](https://biology-forums.com/gallery/47/medium_376021_22_08_15_1_40_21_223431218.jpeg)
![The photo shows an ultrasound image of a fetus. The rough outline of a head and body can be seen. ...](https://biology-forums.com/gallery/47/medium_637842_18_01_17_5_49_28_24485826.png)