Peer review. This is the basis of much of the scientific method: repeatability.
A secondary source is anything written after the fact
Answer:
Hepatitis A infection can be prevented by getting vaccine or immune globulin soon after coming into contact with the virus. Persons who have recently been exposed to HAV should get immune globulin or vaccine as soon as possible, but not more than 2 weeks after the last exposure.
Explanation:
You can take steps to reduce the risk of passing hepatitis A to others.
Avoid sexual activity. Avoid all sexual activity if you have hepatitis A.
Wash your hands thoroughly after using the toilet and changing diapers.
Don't prepare food for others while you're actively infected.
The efficiency indicates the manner in which the inputs are used by the system. Being efficient means the system uses inputs in a `right' way. If the input-output ratio is adverse, we say that the system is inefficient though it produces the desired output.
Options B, C, D, this rock has some coarse grains, the grains are very big and it has a non-banded pat-tern, are the right answers.
The rock in the given image can be recognized as the Granite rock. It is a popular type of felsic impertinent igneous mineral that is phaneritic and granular in texture. Depending on their mineralogy the color of the Granite may vary from white to pink and grey.
