Believed that as animals became more complex, so did their emotions. charles darwin george romanes carolus linnaeus ivan pavlov

The correct answer will be option- Carolus Linnaeus

Explanation:

Carolus Linnaeus is known for his contribution to the classification system as well as the nomenclature system of organisms.  

He also provided two classification system of the organism which classified organism into two groups- plants and animals. He classified the organisms based on the morphological characters.  

He also observed the behaviour of animals and predicted that emotions of animals depend on the complexity of the organisms. He predicted that as the animals become more complex their emotions also become complex.

Thus, Carolus Linnaeus is the correct answer.

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