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But dinosaurs didnât appear until about 230 million years ago. Mammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years.And recorded civilization has lasted only about 5,000 years.ammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years. And recorded civilization has lasted only about 5,000 years.
Quick Answer. Plant life first appeared on land during the Ordovician period, between 495 and 443 million years BCE. One 2001 study from Penn State University claims that plants and fungi first appeared on land 700 million years BCE, but this has not yet become accepted by the larger scientific community. Continue Reading.