[Grammar] Humans or a human

[Rabab134]

Can I say: "humans" or " a human" takes oxygen and releases co2? Is it plural or singualar?

 

[Tdol]

Inhale/breathe in might work better than takes, and you would have to adjust the verb for sinngular or plural, but both forms are possible.

 

[jutfrank]

As you are making a broad generalisation, I suggest you use the plural humans.

Humans breathe oxygen.

 

[teechar]

Hello Rabab134, and welcome to the forum.

If you wanted/needed to use the singular, use "a human".

 

[emsr2d2]

We write "CO2", not "co2".

 

[Rover_KE]

There generally has to be a good reason for saying 'humans'.

Normally we say 'people'.

 

[Raymott]

I think that explaining physiology, especially comparative, is a good reason.
"Humans breathe oxygen into their lungs; fish have gills."
"Humans and other mammals take in oxygen; plants give off oxygen."