Which among the following is referred as a “Living Fossil” ?

Balanas
Daphnia
Sarcoptes
Limulus

The correct answer is (d) Limulus.

A living fossil is a species that has remained relatively unchanged for millions of years. Limulus is a horseshoe crab that has been around for over 450 million years. It is one of the few living members of the arthropod

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group Xiphosura, which also includes extinct species such as the sea scorpions. Limulus is found in shallow coastal waters around the world. It is a filter feeder and eats small organisms such as plankton. Limulus is an important part of the marine ecosystem and is also used in medical research.

Balanas is a barnacle that is found on the shells of whales and other marine animals. It has been around for about 150 million years. Daphnia is a small freshwater crustacean that is found in ponds and lakes. It has been around for about 50 million years. Sarcoptes is a mite that causes scabies. It has been around for about 10 million years.

Limulus is the only living fossil that is a member of the arthropod group Xiphosura. The other options are not members of this group.

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