Calcium is vital for the development of the skeleton (strong bones).
No, iron in the body doesn't affect bluetooth signals. All the iron combined in the body would be such a minuscule amount it's absurd to think that is even a possibility.
Lack of iron would mean lack of heme, and thus lower amounts of functioning cytochrome proteins. This would mean lower energy yields.
The pH is not affected by iron (Fe).
No, caffeine directly affect the absorption of iron. It is the polyphenol compounds in coffee and tea that negatively affect iron absorption. Drinks containing polyphenol compounds should be avoided at least an hour prior to, and and hour after taking iron supplements or eating foods that contain iron to ensure they do not interfere with iron absorption.
yes
Steel contains a large proportion of iron which affects compass needles.
it keeps you strong
A comet would not have enough iron to affect the Sun in any measurable way. Even a Jupiter-sized planet made of iron would not stop solar activity. The production of iron by a star is an endothermic fusion reaction. Any mass of iron nearing the Sun would be vaporized, and whatever entered the solar interior would circulate for many hundreds of years before any could reach the core.
it makes your dean huge
Yes
split europe in to two parts.
There are no known drug interactions between iron tablets and birth control.