The age at which menstration begins been increasing in developing and industralized countries over the past 100 years. has been the same over the history of our species. has been declining in developing and industralized countries over the past 100 years.

The age at which menstruation begins has been declining in developing and industrialized countries over the past 100 years.

Explanation:

The average age at onset of menstrual periods varies between 12 and 13 years in industrialized countries, typically 2 to 2.5 years after the onset of breast development. Menarke is expected in most about a year in one direction or another from the average; for example, with the US average of 12.43 years, menstrual periods have only begun at 10% at 11.11, but already at 90% at 13.75. By the age of 15, the share will reach 98%.

In the 1860s, the average age at onset of menstruation in current industrialized countries was 16.5 years, after which it gradually declined. Early development has been found to continue beyond the 1960s. Nutrition appears to play a key role in the timing of menarche, as nutritionally scarce times have been reflected in past centuries as the onset of menstruation increases. In developing countries, menarche, like other forms of puberty maturation and growth, may be delayed compared to industrialized countries.

the articles of confederation only set up the continental congress at the federal level. there were no executive or judicial branches except within the states. the states were allowed to keep every right that was not specifically given to congress. the bonding of the states was through a 'firm league of friendship' that best served as a defense agreement against invasion. states were not allowed to use taxes as a way to discourage treaties, and states were extremely limited in their dealings with foreign nations.

not many historians today talk about the strengths of the articles of confederation, likely because of how unpopular the document quickly became. the articles did set the legislative body, congress, as the highest power in the nation because of the fear of monarchy. congress had the sole power to declare war, assign treaties, entertain foreign relations, and operate post offices. disputes between states and territorial issues were to be brought to congress. the document also stipulated that canada was allowed to enter the union if they desired.

there were more weaknesses than strengths under the articles of confederation. the lack of power given to the continental congress strangled the federal government. the articles gave congress the power to pass laws but no power to enforce those laws. if a state did not support a federal law, that state could simply ignore it. congress had no power to levy taxes or regulate trade. without a federal court system or executive leader, there would be no way to enforce these laws, either. amending the articles of confederation would also require a unanimous decision, which would be extremely difficult.

the 9th amendment

explanation: