In which of the following sentences does the preposition express a spatial relationship? a. yvonne's cat hid under the table. b. we didn't stop by midnight. c. upon hearing that, maria promptly left the room. d. i waited outside until it got too cold.

A spatial relationship is related to place. Hence, the best answer is A, since the word "under" refers to going below an object, and this is related to space. The use of "by" in B is related to time. Choice C does not have a preposition related to space, and neither does choice D.

Answeralong with the tissue lining,the blood,tissue,and unfertilized egg leave the uterus,going through the vagina on the way out of the body,(menstrual period);

Pickling is the process that uses a vinegar solution to preserve foods.