Is there supposed to be a picture here? I cannot give you an answer from what is here.
The structure in the image provided is of the womb of a pregnant woman. The major function of Structure X is to exchange materials between the mother and the fetus.
Because we can't take in light energy directly, we consume plants. Plants convert light energy into chemical energy through the process of photosynthesis. So when we eat plants, we get the chemical energy stored in the carbohydrates, which fuels all our physical activity.
The spiral usually begins with an increase in demand. The direct effect of this increase is that the producers (of commodities) raise prices to continue to make a profit. It usually begins with a rise in production costs.
