peristome

"Many students learn about invertebrates, like insects and worms, in biology class because they are animals without a backbone. "

"The detective was able to identify the suspect from the security camera footage. "

"He examined the crime scene for clues."

"Be sure to finish your homework before you go to bed!"

"The insect had several appendages, including antennae and legs, that helped it move and sense its surroundings. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"Turn the doorknob to open the door."

"The student had numerous assignments to complete before the weekend. "

"an aperture in a wall"

"The large oak tree surrounding the picnic area provided welcome shade. "

"The scientist studied the effects of different types of soil on plant growth. "

"The gingerbread was delicately, if imprecisely, captured by the brushstrokes."