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a sphere, spiral and a rod
Viruses have four main shapes: 1. spherical (like a ball) 2. helical (like a corkscrew or a spring) 3. Icosahedron (a twenty-sided shape kind of like two prisms glued together) 4. Bacteriophage (an icosahedron head and a spider-like tail)
There are many geometric shapes. But the square, octagon, rectangle, pentagon, triangle, circle, hexagon and heptagon would be considered the main shapes.
There are at least 20 different types of glaucoma. These can be divided into four main types
It depends on the nature of its genome