About"We Are The World"

Hello,

About the the song "We Are The World", I found different lyrics.

I) On the site:
http://www.lyrics007.com/Michael%20Jackson%20Lyrics/We%20Are%20the%20World%20Lyrics.html

I found: 'There comes a time when we "hear" a certain call '.

On another:
https://www.youtube.com/watch?v=NxSFTUCjamc

I found: 'There comes a time when we "heed" a certain call'

Is the correct word "hear" or "heed" and what would be the exact meaning of "heed" in this case?

II) On the site:
http://www.lacoccinelle.net/248828.html

I found: 'We are the ones "to" make a brighter day'

And on the site :
https://www.youtube.com/watch?v=NxSFTUCjamc

I found: 'We are the ones "who" make a brighter day'

Personally, I prefer 'We are the ones "who" make a brighter day'
but is the sentence 'We are the ones "to" make a brighter day' acceptable?

III) I found: 'we're saving "our" own lives' , on the site:
http://www.lyrics007.com/Michael%20Jackson%20Lyrics/We%20Are%20the%20World%20Lyrics.html

and 'we're saving "out" own lives', on the site:
https://www.youtube.com/watch?v=NxSFTUCjamc

Does the sentence 'we're saving "out" own lives' have a sense?

IV) On both sites:
http://www.lyrics007.com/Michael%20Jackson%20Lyrics/We%20Are%20the%20World%20Lyrics.html

https://www.youtube.com/watch?v=NxSFTUCjamc

we can read : '"Gods" great big family' , should the correct spelling not be '"God's" great big family"( God's instead of Gods)?

Thank you for your help.
mi_li_mi