At the least, once a year.
This can vary between people with certain partners and such. You should test before symptoms appear because usually, once symptoms appear, it is too late to be cured or treated.
Every six months can be frequented and sometimes preferred but is not required. Once a year is the least a person could do to test for STD's.
Hope this helps!
Answer:
B. a substance that sends the immune system into action
Explanation:
Answer:
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C.
Explanation: A long term goal and a short term goal can both be achieved in the future, an unrealistic goal cannot be achieved at all. A realistic goal is the best answer.