4.Mark the following important events on your brace map next to the correct peric EVENTS single-celled organisms; 3.500 million years ago Trilobites, 500 million years ago Early land plants: 430 million years ago Reptiles: 280 m.y.a. Fish: 395 m.y.a. Whales: 20 m.y.a. Dinosaurs: 225-65 m.y.a. Mammals: 65 m.y.a. Humans: 2.5 m.y.a. Birds: 120 m.y.a. Pangaea starts to separate: 225 m.y.a. Flowering plants ERA PRE-CAMBRIAN PERIOD Precombro​