zooxanthellæ are abundantly present within the cells of the digestive glands. Here then is another animal digesting intracellularly and harbouring a unicellular green alga within its tissues.

A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria. Yeast are unicellular fungi. They are used by brewers ...

A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria. Yeast are unicellular fungi. They are used by brewers ...