Which of the following is a living fossil?

The correct option is D

Cycas

Living Fossil

1. Organisms that relative is not present on earth are called living fossils.

Correct option is (d)-

The explanation of the incorrect option

1. Cycas were present on earth before the dinosaurs and did not evolve much, so they are called living fossils because they have been present on earth for millions of years, and there are no closer relatives of Cycas.

The explanation of the incorrect option

Option (a)-

1. There are many varieties of mosses present on earth.

Option (b)-

1. Saccharomyces is a fungus that consists of many species of fungi.

Option (c)-

1. Spirogyra is a genus of green algae. It contains 400 species of green algae.

Final Answer: Cycas is known as a living fossil.