Penny is the answer, the rest are types of currencies.
seaweed
Create
aerobic
None
The word LETTER does not belong, because it is the only word in this group that does not spell valid word when spelled backwards!
keratinocytes
what group is arclic belong to what group is arclic belong to
Rift
sign
they belong to the insects group
The vertebrate group in which humans belong to is the mammal group.Humans belong to the Mammal group.
train