carbon and silicon are in group 4 of the periodic table. the atomic radius of carbon is 77 pm and sulfur is 103 pm. what is the circumferences of each atom?

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?