Which term describes a tiny, membrane-bound structure inside a eukaryotic cell? organelle cytoplasm protein nucleic acid

The answer would be Organelle.

Explanation:

so as you know there are remains known as fossils and they form by something unaliving and sinking to the bottom of the oceanthen sediment covers that corpse then what is soft like cartiledge and organs are broken down then sediment becomes rock then the bone will ether make a cast and show what the bones looked like with hardened rock or they make a mold and they leave behind an empty space that looks like the bone/shell