I video conferenced with the client this morning.

Throughout the process of algal and plant evolution, the mode of mating has evolved from isogamy to unisogamy, and, finally, oogamy. While all three types are seen among algae, only oogamy is found among land plants.

How do you solve this puzzle?

They also have to make allowance, in place of primogeniture, for the practice of tanistry, that is, the naming of a successor who was not necessarily the ruler's son.