Where does the krebs cycle occur? A. Cytoplasm
B. Mitochondrion
C. Cell membrane
D. Nucleus

B. Mitochondrion

Explanation:

The Krebs Cycle occurs in the mitochondria during the processes of cellular respiration.

Specifically, it occurs in the matrix of the mitochondria.

Mitochondrion

Explanation:

I took the test and it was correct

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.