The word LETTER does not belong, because it is the only word in this group that does not spell valid word when spelled backwards!
Penny is the answer, the rest are types of currencies.
what group is arclic belong to what group is arclic belong to
Rift
seaweed
sign
they belong to the insects group
The word "telephone" does not belong in this group because all the other words—puzzles, train, and checkers—are types of games or activities. A telephone is a communication device, not a game or activity.
Humans belong to the group of vertebrates known as mammals.
Penguins belong to the group of flightless birds.
train
what does this mean?!.