True or false an iris diagram is a set of overlapping metal plates that can expand out to allow more light or fold in on each other to reduce the amount of light

The period that marks the paleolithic era is between the 250,000 to 10,000 years.

Iwould go with write exactly two extra paragraphs to point out additional information. but the keyword "exactly" throws me off. leads me to believe it's d. go with your gut feeling. either "write exactly two extra paragraphs" or "none of these".