Because they very harmful organisms that cause alot of disease to people
Yes
Good hygiene.
handwashing
I depends on the disease. Viral diseases often have vaccines. Heart disease can be prevented with good diet and excercise. Mosquito borne diseases can be prevented by using insect repellent.
Good hygiene and timely vaccination.
As with many diseases it is not known how it may be prevented.
Muscular distrophy
true.
Many diseases can be prevnted by having vaccines and boosters. Diseases that can be prevented by doing these to include: Influenza Chicken Pox Measles Tetanus Hepatitis C Shingles
we can wash our hands and have a bath and be very hygienic.
scew off
"diseases" is a very broad category. It's probably best if you search for specific diseases and then see if they can be prevented from there.