hatched

"The mother bird will incubate her eggs in the nest until they hatch. "

"The train tracks are two parallel lines that run through the entire town. "

"He is a student of life."

"The scientist used an incubator to maintain the perfect temperature for the plant cells to grow. "

"The teacher explained the new math concept quickly. "

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

"supply and demand"

"The maintenance worker opened one of the hatches in the school hallway ceiling to access the ventilation system. "

"My sister's birthday is next week, and we're planning a party. "

"It was a surprise to find out I owed twice as much as I thought I did."

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

"The car dealer only accepted hundreds for the down payment, so I had to go to the bank and withdraw cash. "