During the Krebs cycle, pyruvic acid is broken down into carbon dioxide in a <span>series of energy-extracting reactions.
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exExplanation: external internal
Combustion - the burning of fuels and harmful gases in the atmosphere through factories.
decomposition - when skulls and bones are decomposed to give out carbon dioxide.
diffusion - when the the molecules move from a region of higher concentration to a region of lower concentration.
respiration - when person breathes in oxygen and out carbon dioxide.
photosynthesis - is the process where trees make glucose and oxygen with the help of sunlight and mineral and water from soils.
The correct answer is cubital region. It is the area in the part of the elbow, between antebrachial region distally and brachial region proximally; comprises the anterior and posterior regions of the elbow, the former including the cubital fossa. This is also known as the elbow region.