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Author Question: Of all of the chordate groups, why are there only two amniote groups (reptilia and mammalia)? (Read 34 times) |
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Thyroid conditions may make getting pregnant impossible.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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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.