nucellus

"The protective helmet was essential for the construction worker. "

"The turtle's hard integument protected it from predators. "

"The tall fence surrounds the playground, keeping the children safe. "

"The students are developing their reading skills in their English class. "

"The delicate tissue paper wrapped the fragile antique doll. "

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

"The scientist studied the embryo to understand how the early stages of development occur. "

"Condoms are designed to protect against sexually-transmitted diseases."

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

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

"He examined the crime scene for clues."

"In biology class, the students dissected a frog to learn about its organs. "