<span>B)Both are involved with stages of succession, but pioneer species are the beginning and climax communities are the end result.</span>
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The factors that determines the rate of diffusion in the biological system include: temperature, size of the particles, diffusion distance and concentration gradients. Of all these factors, the most important one is the TEMPERATURE.
The relationship between temperature and the rate of diffusion is a direct one, that is, the higher the temperature the higher the rate of diffusion and vice versa. At high temperature the molecules in the particles move faster because they have higher amount of energy.
I think the correct answer from the choices listed above is option A. Glacial episodes are an example of a positive feedback. Each glacial period in the Earth is subjected to a positive feedback which makes each period more severe. Hope this answers the question.
