Zoology - Evolution Question with Solution | TestHub

About 2000 million years ago (mya), the first cellular forms of life appeared on earth. By the time of 500 mya, invertebrates were formed and jawless fish probably evolved around 350 mya. Seaweeds and few plants existed probably around 320 mya. We are told that the first organisms that invaded land were plants. They were widespread on land when animals invaded the land. Fish with stout and strong fins could move on land and go back to water. This was about 350 mya.