What is the difference between prokaryotic and eukaryotic cells that is directly related to size

Eukaryotic cells contain membrane-bound organelles, including a nucleus. Eukaryotes can be single-celled or multi-celled, such as you, me, plants, fungi, and insects. Bacteria are an example of prokaryotes.

Prokaryotic cells do not contain a nucleus or any other membrane-bound organelle.

The hawk receives 0.1% energy from the caterpillar although the caterpillar gets eaten by another bird smaller than the hawk first