Answer:
Pairs of organs that remove waste from the blood are the kidneys
You can prevent the spreading of communicable disease by following through with Option C) avoiding sharing personal items, like toothbrushes. All of the other options can lead you to getting a disease, if you ignore hygiene you will never be clean, and if you avoid insect repellent you might get a disease from a bug, and if you cough/sneeze without covering your nose/mouth then you may catch a cold. Therefore pointing to the correct answer option C.
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Electricity is the manifestation of traveling currents. These currents however are unable to move unless one were to complete a "circuit" (Word you are looking for). If the circuit is not completed electricity doesn't travel.
The vaccines that are required by law, according to the Childhood Vaccine Injury Act of 1986 are:
1. Diptheria, Pertussis and Tetanus Vaccine (DTP, DTap, DT, TT or Td)
2. Measles, Mumps and Rubella Vaccine (MMR)
3. Chickenpox Vaccine (Varicella)
4. Rotavirus and Pneumococcal Conjugate Vaccines
5. Haemophilus Influenzae type b Vaccine (Hib)
1: b
2: c
3: c
i hope this is right