As humans we have a hard time telling penguins apart. However, They can tell each other apart by distinct vocalizations.
Meerkats tell each other apart with smell and dominant
He's still fluffy so you can tell him apart from the rest of the penguins. You can't really tell all the other penguins apart.
Apart from that, I couldn't tell you. The tow truck will pull the cars apart from each other.
by their ID cards
Well that's simple! you can tell them apert if you mark them or by their behavior.
yes
Each was given a number. It was tattooed on the inside of the forearm.
yes
unfortunately they could not always tell so friendly fire killed many soldiers
Monarks have 1dot on each wing on the male.
Two lines are parallel when they remain equal distance apart and never intersect each other
They all describe data set or data sets,hey tell you how far apart they are from each other.