So her agency has concluded that it is a known organism that is difficult to grow or a novel one.

They were the first known organisms to photosynthesis and produce free oxygen.

The plant is estimated to weigh collectively 6,000,000 kg (6,600 short tons), making it the heaviest known organism.

The cyanobacteria in stromatolites were the first known organisms to photosynthesis and produce free oxygen.

There is only one known organism with known structure, it is Candida albicans.

No known organism needs more than one mother and one father.

A preface to the show informs viewers that "the virus is the only known organism which needs a higher form of life to replicate."

They suggest it has been growing possibly since the end of the last Ice Age, making it older than any other known organism on earth.

These whales are the only known organisms to take advantage of the Tubercle Effect.

It is notable as having one of the smallest genome among known eukaryotic organisms, containing only 2.25 million base pairs.