She was considered a popular teacher who led an interesting biology lesson.

Something he learned in one of his biology lessons, when he doesn't do any work.

And he didn't feel much like taking biology lessons.

These anecdotes he managed to turn into a biology lesson.

Physics, chemistry, and biology lessons are normally conducted in the science laboratory.

She was anxious to resume the biology lessons, and they went on a thorough tour of the lab.

"This is not a big biology lesson," he said.

I don't need a biology lesson, especially from someone who failed it in school.

Perhaps these scientists to whom you refer have forgotten their middle-school biology lessons.