Put these events in Earth history in order.
Oldest < second oldest < ... < youngest:
1. production of oxygen by photosynthetic organisms
2. rigin of eukaryotic cells
3. earliest evidence for life on Earth
4. appearance of first tetrapods on land surfaces
5. Cambrian "explosion"
Answers: 1
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Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.
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Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?
Answers: 2
Put these events in Earth history in order.
Oldest < second oldest < ... < youngest:<...
Oldest < second oldest < ... < youngest:<...
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