Which influence is external

Internal factors -- also known as hereditary factors or acquired elements -- include smoking and personal diet or eating habits. External factors pertain to the direct outer environment, the geographical location and micro-organisms that could affect an individual's health

Explanation:

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."

answer:

It is true because...

Explanation:

but black guys,girls tend to have better voices than most people