A region with a reason.
Connect a named region or label to the image it belongs to.
Use existing diagrams and turn them into practice material.
A learner follows the original public-domain mitochondrion image through analysis, nine saved label positions and a recall question. The Blobatar considers the prompt, then answers Matrix. Other question formats appear below. No label-generation request occurs.
Connect a named region or label to the image it belongs to.
Built-in educational media is Free. Personal image uploads require Plus; review source credits and rights before sharing.

Keep the original image.