By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
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Explanation:
A star of one solar mass remains in main sequence for about 10 billion years, until all of the hydrogen has fused to form helium.
Answer:
Senses that its too cold and turn the heat on and warm it up
Explanation:
the amount of matters refers to the mass