Answer:
Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O) atoms. There are two main types of chemical bonds that hold atoms together: covalent and ionic/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds.
Transverse waves contain crests & troughs
while longitudinal waves contains compressions &rarefactions.
The most common pathogen then carry is protozoa , that causes malaria
