DENDROLOGY

Detailed explanation-1: -Both have leaves, stem, and roots. Hint: Both have similar basic parts and structure of the plants, thus making it similar in structure except the flowers because the gymnosperm is found to be more simple as compared to the angiosperm that is more advanced like they produce fruit to protect seed.

Detailed explanation-2: -Both Gymnosperms and Angiosperms have well-differentiated roots, stems, and leaves. They are Phanerogams that are characterized by the presence of seeds, unlike Cryptogams that do not form seeds.