Question

which organelle does cellular respiration happen in?
mitochondria
nucleus
chlorophyll
chloroplast

Explanation:

Cellular respiration is the process by which cells convert nutrients into energy (ATP). Mitochondria are known as the "powerhouses" of the cell because they are the main site where this process occurs. The nucleus contains the cell's genetic material. Chlorophyll is a pigment involved in photosynthesis (not cellular respiration). Chloroplasts are the organelles where photosynthesis takes place in plant cells.

Answer:

Mitochondria