Consider this animal cell.

The organelles in an animal cell are labeled. Part I is the round structure at the center of the cell.

Which organelle is labeled I?
cell membrane
ribosome
endoplasmic reticulum
nucleus

The nucleus is the central organelle of a eukaryotic cell (animals are eukaryotes).

Explanation:

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics