<span>Dense layer holding in natural gas and petroleum</span>
Sample b is the control group because it’s the group not being tested and being kept the same.
The correct answer is b, photosynthesis.
Answer:
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Answer:
The correct answer would be a. Fragments of DNA that have desired genes are isolated to form recombination DNA for use in a host. Genetic engineering refers to the direct manipulation or modification of the desired gene in a cell in order to produce novel or improved organism.
Explanation: