TOEFL Reading: ETS-TOEFL阅读机经 - 3VY2LFTUBOJWB3A1L$

According to paragraph 1, how did the majority of plant species arrive on islands created by geological processes such as volcanism? A. They were transported by ocean currents. B. They were carried to the islands by birds. C. They were brought to the islands by humans. D. They were transported by winds.