Answer:
Metal detectors help the shop owners to avoid thieves and shoplifters. When an apparel has got a security tag, it is safe for the sellers because thieves cannot avoid the metal detector while exiting the store. The security tag has got a metal itself which cannot be pulled off easily.
The prefix bi mean two.
Bicycle: It has (2) wheels. And binary fission is a type of asexual reproduction where a cell splits into 2.
