Biology, 12.08.2020 09:01 heyhay5748
Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earliest water. 4.1 billion years ago, Single celled life. 3.5 billion years ago, Earliest oxygen and photosynthesis. 2.5 billion years ago, Complex single celled life. 1.5 billion years ago, Multi cellular life. 500 million years ago, Land life. 300 million years ago, Dinosaurs. 200 million years ago, Mammals. 130 million years ago, Flowers. 5 million years ago, Humans. Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? 130 million years ago 1.5 billion years ago 2.5 billion years ago 4.1 billion years ago
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Biology, 21.06.2019 19:00
Iron reacts with oxygen to produce iron oxide (rust). this reaction is represented in an equation as 4fe + xo2 → 2fe2o3. identify the value of x that will balance the equation.
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Biology, 22.06.2019 13:00
This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic.
Answers: 1
Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earli...
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