What organelle is the thin barrier between inside and outside?

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?

What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome

The sea slug that considered to be a photosyntheesizing animal