How can the variables light, water, and plant change

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

During convection, less dense fluid rises and denser fluid sinks.