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the answer is d
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Answer:
Explanation:
Never still, the earth and its environment are constantly changing. ... Surviving in a changing world is difficult if an organism cannot change along with it. ... Slowly, the population of fish will become more fully adapted to its new environment. ... Sometimes the changes cannot take place fast enough and a whole population
An in-breath is that you are breathing in Oxygen. And and out-breath you are breathing out Carbon Dioxide
The method of self-announcement is frequently done IN SMALL TOWNS.