Let k be a body body and s ⊂k [x], deg (f)> 0 ∀f ∈s. let l1 and l2 be decomposition bodies of s. seiσ: l1 → l2 is a k homomorphism, i. a body homomorphism.

what is the meaning of f here ? what is the meaning of s here ? what is the meaning of l1 here?

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.