In Every Western Country for Which Records Exist, There Has

question 94

Multiple Choice

In every Western country for which records exist, there has been a downward trend in the age of menarche over the last 150 years due to improvement of nutritional and medical knowledge.This trend is known as the __________.

• A)secular trend
• B)lowering trend
• C)early onset trend
• D)sooner trend

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Definitions:

Ionic Bond

A chemical bond formed between two ions with opposite charges through the transfer of one or more electrons from one atom to another, resulting in an electrostatic attraction that holds the ions together.

Polar

A molecule or part of a molecule containing regions with slight charges due to uneven electron distribution, leading to interactions with other charged molecules.

Nonpolar

Describing molecules that do not have distinct positive and negative poles, resulting in a lack of electronegativity difference between the atoms.

Single Covalent

A type of chemical bond where two atoms share one pair of valence electrons.