When the atlantic ocean opened during the middle mesozoic era around 144 million years ago, the differences between the species living on opposite shores gradually the greater the distance, the the number of characteristics in common. plate activity resulting in continental drift forced diversification of life.

Answer – Increased; Smaller

About 144 million years ago, at the time of the middle Mesozoic era, the Atlantic Ocean opened. When this happened, the differences between the species living on opposite shores gradually INCREASED. The more the distance, the SMALLER the number of characteristics the species have in common. 

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