Sir issac newton: a. proposed the elliptical orbit of the planets b. applied mathematical reasoning to many astronomical theories c. used mathematical calculations to discover the planet neptune d. all of the above

B. applied mathematical reasoning to many astronomical theories
C. used mathematical calculations to discover the planet Neptune

were done by other people. For Newton himself, the ans is

A. proposed the elliptical orbit of the planets

A. proposed the elliptical orbit of the planets

B. added mathematical reasoning to many astronomical theories

C. used calculations to discover the planet Neptune

YOUR WELCOME

Explanation:

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

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.