Which of the following are NOT found in all vascular plants

a) phloem
b) xylem
c) seeds
d) carbohydrate molecules

I think the answer is C but im not sure. Thanks in advance!!

You are right. Xylem and phloem are the two forms of transport tissue in vascular plants. Carbohydrates are found in all plants, since plants make sugar (a carbohydrate) via the Calvin Cycle. That leaves only seeds, and I found a link posted below that proves that not all vascular plants have seeds :)

C) seeds. ----->Not all vascular plants use seeds for reproduction

By definition, all vascular plants have xylem in phloem. Without carbohydrates, plants would die