Why do hormones affect specific cells only?

Are substances released into the environment that in excess amounts cause damage

What are the result of when individual components in an organism interact with others to create noval stucture and function called

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?