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Author Question: Internal organs develop from which germ layer? a. the endoderm b. the mesoderm c. the ectoderm d. ... (Read 45 times) |
Approximately 500,000 babies are born each year in the United States to teenage mothers.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
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.