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.
Staphylococcus (bottom). There are a lot of similarities between Streptococcus (Strep) and Staphylococcus (Staph) that lead to confusion. Both are: 1  spherical, facultatively anaerobic gram-positive bacteria. 2  common members of the normal human microbiota.3  capable of resisting many forms of important antibiotics.taphylococcus (bottom). There are a lot of similarities between Streptococcus (Strep) and Staphylococcus (Staph) that lead to confusion. Both are: 1  spherical, facultatively anaerobic gram-positive bacteria. 2  common members of the normal human microbiota.