Should this be Weeks or Week?

[crussell]

Ten weeks old jack pines were exposted to S0 concentrations from 3.9 to 39 mmol.

Ten weeks or ten week?

Thanks!

[Philly]

.
You should say ten-week-old jack pines.
.

[arn]

i agree; however, how about the rest of the sentence?

[Philly]

.
The rest of the sentence appears to discuss concentrations of sulphur oxides (?). (Science is not my cup of tea. ) Possibly "exposted" is a typo and should be "exposed"...? Maybe crussell will enlighten us.
.

[MikeNewYork]

.
The rest of the sentence appears to discuss concentrations of sulphur oxides (?). (Science is not my cup of tea. ) Possibly "exposted" is a typo and should be "exposed"...? Maybe crussell will enlighten us.
.

I agree about "exposed". SO is sulfur monoxide and is an unstable compound (SO2 is the more common form.) I would also say concentration of 3.9 to 39 mmol per [some volume - usually liter]

[crussell]

Yes, it was a type. It should be exposed. Thank you.

[MikeNewYork]

Yes, it was a type. It should be exposed. Thank you.

You're welcome.