Rice, wheat, soybeans, and are considered the four angiosperms that are responsible for early agriculture. is a plant hormone associated with fruit ripening, rotting, and flowering but not with seed dormancy, germination, or growth. Many plants, such as trees, have complex chemical changes inside them that prepare them to go during the winter. The is the male structure in a plant that produces pollen. The is sticky and receives pollen from pollinators, to transfer to the ovaries. To protect their seeds and allow for dispersal, plants can develop to protect the seeds. Moisture and determine many seeds' germination rates. What advantages do animal pollination bring to angiosperms that might explain the dominance of these relative newcomers among the plants?