Describe HOW fossils can provide evidence of how environmental conditions and life have changed during Earth's history.

By studying fossils, scientists learn how much organisms have changed as life developed on Earth. There are space in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind.

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

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