Age of Menarche. Menarche marks the commencement of the reproductive phase of a woman's life. Records suggest that there was a secular decline in the average age at menarche in developed countries across the 19th and 20th Centuries until the 1950s, with an average age at menarche of 15-17 years reported in the mid-19th Century.
CHARACTERISTICS: Streptococcus pyogenes is an aerobic, gram-positive extracellular bacterium. It is made up of non-motile, non-sporing cocci that are less then 2 Âµm in length and that form chains and large colonies greater then 0.5 mm in size.HARACTERISTICS: Streptococcus pyogenes is an aerobic, gram-positive extracellular bacterium. It is made up of non-motile, non-sporing cocci that are less then 2 Âµm in length and that form chains and large colonies greater then 0.5 mm in size.
Streptococcus pyogenes is not a bacteria that should be taken lightly. Many people carry the bacteria without incident, however it has the potential to cause both mild and severe diseases. Streptococcus pyogenes has claimed many lives, including that of Muppet's creator, Jim Henson.any people carry the bacteria without incident, however it has the potential to cause both mild and severe diseases. Streptococcus pyogenes has claimed many lives, including that of Muppet's creator, Jim Henson.