Answer;
-Pollination;
Step-by-step explanation;
-Not only do angiosperms use wind/insect pollination, their modified specifically for it! Plants that use wind pollination are designed to have a lot of light seeds that can be carried over large distances. Plants meant for bugs will have markings to attract them, or sweet sugary rewards.
-Pollination by insects and pollination by wind are the major advantages of angiosperms. Without them, they can't have their pollen transferred over long distances and fertilization cannot occur.