C. They are specialized tissues that form an organ system.
hope it helps!
First blank space is endocrine system and the second blank is hormones
The matrix (inside mito) has a negative charge compared to the intermembrane space (outside of mito but still inside) because positively charged protons are constantly pumped from the matrix to the intermembrane space. A cell oxidizes an organic molecule producing 3 NADH molecules and 3 FADH2 molecules..
The answer would be bone marrow
