Four different forest biomes are possible, depending on rainfall, temperature, and the timing of the two. these are __

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The answer is 
the taiga, temperate forests, charral, and tropical rain forests.

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This is called visual imagery. it is a memorization technique wherein an idea or a term is associated with an image, this in remembering ideas, especially as humans are very visual learners. this is also why visual aids a lot for memory retention.