1. Annotate the calendar below to show approximately when the four seasons occur during the year.

Spring runs from March 1 to May 31

Summer runs from June 1 to August 31

Fall (autumn) runs from September 1 to November 30

Winter runs from December 1 to February 28 (February 29 in a leap year).

Explanation:

According to the meteorological definition, the seasons begin on the first day of the months that include the equinoxes and solstices:

Spring runs from March 1 to May 31;

Summer runs from June 1 to August 31;

Fall (autumn) runs from September 1 to November 30; and

Winter runs from December 1 to February 28 (February 29 in a leap year).

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.