What type of fungi is most closely related to club fungi?
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Club fungi is most closely related to sac fungi.

The "food" is stored in the endosperm.
They are all part of climate, the statistical summary of temperature, humidity, atmospheric pressure, wind, rainfall, other meteorological measurements in a given region over long periods. In other words, is it dry or wet, hot or cold, or humid? And it is these abiotic factors that help determine the nature of a biome.
Most coelomates possess a "A. Circulatory system" because the main feature of these animals is that they posses a digestive tract, which requires a certain amount of circulation.