|
|
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.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
Asthma cases in Americans are about 75% higher today than they were in 1980.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
![The Red-bearded Bee-eater Nyctyornis amictus is a large species of bee-eater found in the Indo-Malay](https://biology-forums.com/gallery/47/medium_12359_29_04_12_6_13_00.jpeg)
![Large families on U.S. farms used to be common. Children helped plant and harvest crops, take care ...](https://biology-forums.com/gallery/27/medium_482573_20_04_17_1_28_35_279821224.png)