antigens

"The students are developing their understanding of fractions in math class. "

"He is a student of life."

"The delicious smell of cookies induces me to eat one even when I'm not hungry. "

"The foreign student in my class has a different cultural background than the rest of us. "

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

"Except for one or two days a year, he usually walks to work."

"My teacher asked for a response to the question, so I wrote an answer on the board. "

"The immune child didn't get sick with the flu, even though everyone else in the class did. "

"My son has severe allergies to peanuts, so we always check the ingredients in his school lunch. "

"The student acted quickly and answered the question correctly. "

"Bees collect pollen from flowers to make honey. "

"The lightning caused thunder."