Half-life<span> <span>(abbreviated </span>t</span>1⁄2<span>) is the time required for a quantity to reduce to
half its initial value. The term is commonly used in </span>nuclear
physics<span> <span>to describe how quickly
unstable atoms undergo, or how long stable atoms survive, </span></span>radioactive
decay<span>. since it reduce to half after 4000 years, so the
half life is 4000 years</span>
Answer:
Blood capillaries
Explanation:
The walls of capillaries are just one cell thick. Capillaries therefore allow the exchange of molecules between the blood and the body's cells - molecules can diffuse across their walls. This exchange of molecules is not possible across the walls of other types of blood vessel.
Gatorade, and Chicken Noodle Soup, as these are made with more than one ingredient.
Yes if a molecule with a COOH group is called a carboxylic acid.
hope that helps