Answer:
living things respire to get oxygen for living cells to function. Without air, there is no life. Plants use Carbon Dioxide (together with sunlight and water) to produce energy and give out Oxygen as a by-product. This oxygen is what almost all animals need to survive.
Explanation:
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The particular polymorphism normallyused for DNA fingerprinting is the Short Tandem Repeats (STRs) which are non-conding portions of DNA that consist of a repeating genetic sequence of DNA code.
Answer:
four billion years ago the earth had a layer of ozone gas