Please choose the correct answer to the question: The theory of continental drift states that the land masses called continents were once closer together and have drifted apart over time. Which circumstance is the strongest evidence in support of this theory?

Answer1: the migration patterns of birds Answer2: the periodic climate changes of Earth Answer3: the large variety of animals on each continent Answer4: the similarity of fossils on different continents

Answer format: answer1/answer2/answer3/answer4