|
|
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
![(a) With few ticks, moose retain a brown coat; (b) at high numbers of ticks, moose self-groom, destr](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_38_22_1976859.jpeg)
![(a) With few ticks, moose retain a brown coat; (b) at high numbers of ticks, moose self-groom, destr](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_38_22_1977554.jpeg)