Answer:
Enjoy!
Explanation:
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive ...
"A. Did You ask dad if he was finished reading that newspaper before You Cut It up for your science <span>project?" uses the demonstrative properly. Although the others are in common usage. </span><span />
