The tomato plant and the oxalis plant both achieve a maximum CO2 utilization rate. Why do you think higher and higher light intensities do not cause an over increasing of CO2 use?

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.