Perforin is a protein that is released by in order to plasma cells; kill target cells cytotoxic t cells; kill target cells b memory cells; switch from igm to igg b cells; bind to epitopes t- cells; stimulate b cells

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?