What are the four major elements that make up ~99% of our atmosphere?

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

What is true of sea slugs in these orders