An organism that uses sunlight and inorganic substances to make organic compounds is called a photoautotroph.

Here's a breakdown:

* Photo-: Refers to light

* Auto-: Refers to self

* Troph-: Refers to nourishment

So, a photoautotroph is an organism that makes its own food (nourishment) using light energy.

Examples of photoautotrophs include:

* Plants: They use sunlight, water, and carbon dioxide to produce sugars through photosynthesis.

* Algae: They also photosynthesize, contributing significantly to the Earth's oxygen production.

* Cyanobacteria: These are single-celled organisms that are considered the ancestors of chloroplasts in plants.

Let me know if you have any other questions!