Correct Answer: Option B

Explanation

The arrangement of organisms in order of increasing complexity is Hydra (a simple multicellular organism), Snail (a more complex invertebrate), Snake (a simple vertebrate), and Owl (a more complex vertebrate). This is because as we move from invertebrates to vertebrates, the level of organization and complexity increases. The complexity of an organism can be determined by its level of organization, from cellular to tissue to organ to system level.

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