they use natural selection because they got separated from their kind and have to make new living also they need to adapt to the environment
In the case of genetic investigation, scientists used fruit flies as their model organism since they share 75% of the genes that cause disease with humans. Fruit flies are also great to work in a research setting because they are relatively easy to take care of, especially compared to larger and more expensive organisms like rats or fish.Answer:
Explanation:
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3: B Nervous system. 4: A Sensing and responding to its external environment.
The mesenteric veins and the hepatic portal vein
The answer to your question is "Diploid.
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