Diatoms are a type of single-celled algae that have a unique cell wall made of silica, also known as glass. This glass-like wall is called a frustule and it gives diatoms their characteristic intricate patterns.

Here are some additional details about diatoms:

* Abundant: Diatoms are incredibly abundant in the world's oceans, lakes, and even soils.

* Photosynthetic: Like all algae, they are photosynthetic, meaning they use sunlight to produce energy.

* Important part of the food web: Diatoms are a crucial part of the food web, providing food for a wide range of organisms.

* Contribute to oxygen production: Diatoms produce a significant amount of the oxygen we breathe.

* Fossil record: The silica frustules of diatoms are very durable and can persist in the environment for long periods, leaving a rich fossil record.

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