The organisms that carry out photosynthesis are called photoautotrophs. Here's a breakdown:

* Photo-: This prefix means "light".

* Auto-: This prefix means "self".

* Troph: This suffix refers to "nourishment".

So, photoautotrophs are organisms that can make their own food (nourishment) using light energy.

Here are some examples of photoautotrophs:

* Plants: Most plants, from trees to grasses to flowers, are photoautotrophs.

* Algae: These single-celled or multicellular organisms live in water and are important primary producers.

* Cyanobacteria: These are bacteria that can produce oxygen through photosynthesis.

* Some bacteria: There are some bacteria that can use different forms of light energy for photosynthesis, such as the light from underwater vents.

Let me know if you'd like to learn more about any of these organisms!