Answer:
21 years
% of parent isotope remaining before safe
6.25%
Explanation:
True but in more depth they both have the some same qualities in function but provide for each other when one makes oxygen, H2O, and energy and cellular respiration makes CO2 and glucose
Besides building teeth and bones, calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body. Your body can't make calcium, so you need to get it from food or supplements. While you're pregnant, try to get at least 1,000 mg of calcium every day.
The tilt of the Earth's rotational axis away or toward the sun. < 22.5°
The charge of a nucleus is positive
