holdfast

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The birds had built an amazing structure out of sticks and various discarded items."

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

"During our field trip to the aquarium, we learned that jellyfish, corals, and sea anemones are all examples of cnidarians. "

"The enzyme lactase helps digest lactose; lactose is the substrate in this reaction. "

"My backpack was securely fastened to the chair, so I knew my books would stay put during the presentation. "

"He wanted to exhibit his baseball cards."

"Suzanne collected all the papers she had laid out."

"The heavy box underlying the lighter one caused the whole stack to wobble. "

"The attachment of the student's name tag to their backpack was a simple but necessary step before class. "

"to suspect the presence of disease"

"Scientists study different organisms, such as bacteria and plants, to learn about life on Earth. "