<span>When there is no oxygen, or the organism cannot use oxygen for respiration.
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Answer: A<span>n increase in trade across the continent. </span>
Answer - Well there are many benefits but heres are the mainly benefited engineer crops.
Helps resistant against the bacterial or contagious disease that can kill crops.
Helps create the reproduction/production of bigger (size) crops.
Helps create modified crops for more nutritive values.
These are the few main reasons but theres more.
The answer is chemical energy
Scientific theories explain why something happens and scientific laws describe what happens