enzymes

"The enzyme's presence catalyses the breakdown of lactose in milk, making it easier to digest. "

"The astronomer pointed out the globular cluster in the night sky. "

"There is still time to oppose this plan."

"They were eating unleavened bread."

"The baker leavened the dough with yeast to make it rise. "

"The school's science fair featured several different biological specimens. "

"You need to learn to be more tolerant of difference."

"To explain a chapter of the Bible."

"My mother added extra protein to her lunch to help her build muscle. "

"The announcement of the verdict brought a violent reaction."

"The hikers were warned about the deep swallow near the trailhead. "

"The scientist studied the chemical composition of the soil sample. "