Answer:
A.
Explanation:
Because the trait undergoes a secondary loss; it has been there but it doesn't always appear in all generations.
A. Competition amoumg large predatora
The answer Is the letter D
Answer:
It is difficult to obtain a final conclusion with this information, but it is possible that the sample doesn't contain living organisms whose genetic material is composed of DNA. Another possible reason for this result is that the DNA extraction protocol used in the experiment is not suitable for this sample.
Answer:
The instruments that is being used to care for the instrumentation and supplies that have been exposed to the inside of intestinal tract are kept aside from the other sterile instruments.
The instruments are kept aside to protect the other instruments from being contaminated by it.
The instruments needs to be sterile as it cannot be replaced again and again for every technique that is being carried out in patients.
So, the instrument that is used once are kept separated.