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"The science teacher conducted an experiment to demonstrate how plants grow in different types of soil. "

"The student used a microscope to see the tiny cells in the plant leaf. "

"The waters of the lake were transparent until the factory dumped waste there."

"The scientist carefully examined the substance to determine its chemical composition. "

"The twins resemble each other."

"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. "

"The scientist analyzed the molecular weight of the new protein sample. "

"During the winter science lesson, the teacher showed us pictures of snowflakes and explained their unique hexagonal shapes. "

"The math problem required us to understand the dimensional relationships of the cube. "

"Hey, beautiful!"

"Inspect the system for leaks."