|
|
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
In 1864, the first barbiturate (barbituric acid) was synthesized.
Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.
![An adult male killer whale with its characteristic tall dorsal fin swims in the waters near Tysfjord](https://biology-forums.com/gallery/47/medium_27599_22_04_12_6_51_00.jpeg)
![Urinometer. In this procedure, a urine sample and urinometer are placed within a tube, and the liqui](https://biology-forums.com/gallery/47/medium_14755_05_10_12_4_17_11_92921634.jpeg)
![Coronary artery bypass graft (CABG). The grafts are often obtained from the patient’s saphenous vein](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_45_100282437.jpeg)