In Central America, more than 90 of species of Acacia are protected by chemicals in the leaves. The leaf petioles have nectaries which secrete carbohydrate-rich nectar which is consumed by the ants. Finally, the tips of the leaflets produce protein-rich Beltian bodies which the ants gather. This includes not only insects but also grazing animals and even people. And, they chew other plants which grow around the acacias, thus preventing those plants from shading the acacias and supressing growth.
Figs have a very unusual flowering system.
The flowers are on the inside of a structure called a syconium , which will develop into the ripe fruit we know as a fig. The female fig wasp enters the syconium through an opening called the ostiole . It carries pollen and pollinates the flowers on the inside of the hollow syconium. At the same time, it lays eggs into flowers with short styles. These flowers develop galls, which are regions of tissue which are stimulated to undergo cell division and multiplication by chemicals released by the female wasp, thus providing the larvae with an ample food source.