<span>The correct answer is B. Human activity. That's why it is said that global warming si not natural because it's human created. This usually means that things like deforestation or usage of fossil fuels or freon or similar things brings climactic change, usually for the worse. Other mentioned aspects are all found in nature and are not something that we can affect. </span>
Mitochondria, using oxygen available within the cell convert chemical energy from food in the cell to energy in a form usable to the host cell.
A functional MRI (fMRI) and/or a PET scan
They both measure the functioning and activity of the brain
Two major regions of the ocean floor are the continental margin and the deep-ocean basin.
It is powered by a combustion chamber in which uranium is burned, or melted rather.