From what I have studied, I think the case is actually the opposite: as a rule, biological phenomena are usually the result of multiple causation because those

From what I have studied, I think the case is actually the opposite: as a rule, biological phenomena are usually the result of multiple causation because those systems are extremely complex and often very resilient. Mario Bunge gave the following example in his book "Causality and Modern Science": even in a simple system like a wire connected to a battery it is not accurate to say "the battery causes the increase in charge in the wire". The increase is determined by the interaction between the battery and the resistance property of the wire, it cannot be explained by the battery alone. A different wire might not have any charge at all. Thinking in this way about a system as complex as bee populations, the probability of multiple causation seems very high indeed.