Both gymnosperms and angiosperms bear seeds, then are they classified seprately ?

How do gymnosperms and angiosperms differ from each other?

In gymnosperms and angiosperms the pollen tube carries the male gamete to the site of fertilization and thus does not require water for fertilization. It is referred as

Gymnosperms bear seeds but lack fruits because they lack

Gymnosperms are different from angiosperms in

Phloem of gymnosperms differ from angiosperms in

In Gymnosperms, seeds are said to be naked because they-

Angiosperms resemble gymnosperms in

Endosperm of angiosperms is different from that of gymnosperms because

In a monohybrid cross between tall pea plants (TT) and short pea plants (tt) a scientist obtained only tall pea plants (Tt) in the F_(1) generation. However, on selfing the F_(1) generation pea plants, he obtained both tall and short plants in F_(2) generation. On the basis of above observations with other angiosperms also, can the scientist arrive at a law? If yes, explain the law. If not, give justification for your answer.