Which virus is correctly matched with its structure?

a. hiv—helical shape
b. polio—polyhedral shape
c. ebola—complex shape
d. bacteriophage—enveloped shape

The correct answer is polio-polyhedral shape.

Poliovirus causes polio in the individual. It can be prevented by taking vaccines against it. The shape of polio virus is polyhedral and to be more precise they have 20 faces. These virus have three dimensional shape. They have 12 vertices and has 20 sided structure.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.