Earth rotates once every a. hour b. 24 hours c. 365 days d. season

Earth rotates or spins on its axis once each day and revolves around the Sun once every year

24 hours

Explanation:The earth spines on it's axis so it doesn't crash into the sun so that we don't all die because of the gravitational pull that the sun so if the earth keeps on spinning on it's axis it will spin for 24 hours

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.