question: stomata are the tiny holes in leaves which let in co2.
Capitalize this past sentence correctly.
A: Stomata are the tiny holes in leaves which let in CO2.

question: the sculpturer wilhelm rasmussen has made this impressive menhir, 9 meters tall with a relief.
Capitalize this past sentence correctly.
A: The sculpturer Wilhelm Rasmussen has made this impressive menhir, 9 meters tall with a relief.

question: a compact recessed luminaire for modular or plasterboard ceilings.
Capitalize this past sentence correctly.
A: A compact recessed luminaire for modular or plasterboard ceilings.